3562 lines
92 KiB
C
3562 lines
92 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All Rights Reserved.
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* Copyright (c) 2004-2009 Robert N. M. Watson All Rights Reserved.
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* Copyright (c) 2018 Matthew Macy
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* Copyright (c) 2022 Gleb Smirnoff <glebius@FreeBSD.org>
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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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* 3. 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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* 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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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/domain.h>
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#include <sys/eventhandler.h>
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#include <sys/fcntl.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/malloc.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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MALLOC_DECLARE(M_FILECAPS);
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static struct domain localdomain;
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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 timeout_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_maxdgram = 2*1024;
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static u_long unpdg_recvspace = 16*1024; /* support 8KB syslog msgs */
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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 | CTLFLAG_MPSAFE, 0,
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"Local domain");
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static SYSCTL_NODE(_net_local, SOCK_STREAM, stream,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"SOCK_STREAM");
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static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"SOCK_DGRAM");
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static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 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_maxdgram, 0, "Maximum datagram size.");
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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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* Several types of locks exist in the local domain socket implementation:
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* - a global linkage lock
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* - a global connection list lock
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* - the mtxpool lock
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* - per-unpcb mutexes
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*
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* The linkage lock protects the global socket lists, the generation number
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* counter and garbage collector state.
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*
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* The connection list lock protects the list of referring sockets in a datagram
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* socket PCB. This lock is also overloaded to protect a global list of
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* sockets whose buffers contain socket references in the form of SCM_RIGHTS
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* messages. To avoid recursion, such references are released by a dedicated
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* thread.
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*
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* The mtxpool lock protects the vnode from being modified while referenced.
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* Lock ordering rules require that it be acquired before any PCB locks.
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*
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* The unpcb lock (unp_mtx) protects the most commonly referenced fields in the
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* unpcb. This includes the unp_conn field, which either links two connected
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* PCBs together (for connected socket types) or points at the destination
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* socket (for connectionless socket types). The operations of creating or
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* destroying a connection therefore involve locking multiple PCBs. To avoid
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* lock order reversals, in some cases this involves dropping a PCB lock and
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* using a reference counter to maintain liveness.
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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 pr_attach() and freed in pr_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 to hold a lock on unp_conn to guarantee
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* that detach is not run clearing unp_socket.
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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_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_LINK_WOWNED() rw_wowned(&unp_link_rwlock)
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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_REF_LIST_LOCK() UNP_DEFERRED_LOCK();
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#define UNP_REF_LIST_UNLOCK() UNP_DEFERRED_UNLOCK();
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#define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
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"unp", "unp", \
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MTX_DUPOK|MTX_DEF)
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#define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
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#define UNP_PCB_LOCKPTR(unp) (&(unp)->unp_mtx)
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#define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
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#define UNP_PCB_TRYLOCK(unp) mtx_trylock(&(unp)->unp_mtx)
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#define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
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#define UNP_PCB_OWNED(unp) mtx_owned(&(unp)->unp_mtx)
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#define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
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#define UNP_PCB_UNLOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_NOTOWNED)
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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_connectat(int, struct socket *, struct sockaddr *,
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struct thread *, bool);
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typedef enum { PRU_CONNECT, PRU_CONNECT2 } conn2_how;
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static void unp_connect2(struct socket *so, struct socket *so2, conn2_how);
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static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
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static void unp_dispose(struct socket *so);
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static void unp_shutdown(struct unpcb *);
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static void unp_drop(struct unpcb *);
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static void unp_gc(__unused void *, int);
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static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
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static void unp_discard(struct file *);
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static void unp_freerights(struct filedescent **, int);
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static int unp_internalize(struct mbuf **, struct thread *,
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struct mbuf **, u_int *, u_int *);
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static void unp_internalize_fp(struct file *);
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static int unp_externalize(struct mbuf *, struct mbuf **, int);
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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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int, struct mbuf **, u_int *, u_int *);
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static void unp_process_defers(void * __unused, int);
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static void
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unp_pcb_hold(struct unpcb *unp)
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{
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u_int old __unused;
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old = refcount_acquire(&unp->unp_refcount);
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KASSERT(old > 0, ("%s: unpcb %p has no references", __func__, unp));
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}
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static __result_use_check bool
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unp_pcb_rele(struct unpcb *unp)
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{
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bool ret;
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UNP_PCB_LOCK_ASSERT(unp);
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if ((ret = refcount_release(&unp->unp_refcount))) {
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UNP_PCB_UNLOCK(unp);
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UNP_PCB_LOCK_DESTROY(unp);
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uma_zfree(unp_zone, unp);
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}
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return (ret);
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}
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static void
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unp_pcb_rele_notlast(struct unpcb *unp)
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{
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bool ret __unused;
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ret = refcount_release(&unp->unp_refcount);
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KASSERT(!ret, ("%s: unpcb %p has no references", __func__, unp));
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}
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static void
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unp_pcb_lock_pair(struct unpcb *unp, struct unpcb *unp2)
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{
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UNP_PCB_UNLOCK_ASSERT(unp);
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UNP_PCB_UNLOCK_ASSERT(unp2);
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if (unp == unp2) {
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UNP_PCB_LOCK(unp);
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} else if ((uintptr_t)unp2 > (uintptr_t)unp) {
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UNP_PCB_LOCK(unp);
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UNP_PCB_LOCK(unp2);
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} else {
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UNP_PCB_LOCK(unp2);
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UNP_PCB_LOCK(unp);
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}
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}
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static void
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unp_pcb_unlock_pair(struct unpcb *unp, struct unpcb *unp2)
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{
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UNP_PCB_UNLOCK(unp);
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if (unp != unp2)
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UNP_PCB_UNLOCK(unp2);
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}
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/*
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* Try to lock the connected peer of an already locked socket. In some cases
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* this requires that we unlock the current socket. The pairbusy counter is
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* used to block concurrent connection attempts while the lock is dropped. The
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* caller must be careful to revalidate PCB state.
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*/
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static struct unpcb *
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unp_pcb_lock_peer(struct unpcb *unp)
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{
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struct unpcb *unp2;
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UNP_PCB_LOCK_ASSERT(unp);
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unp2 = unp->unp_conn;
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if (unp2 == NULL)
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return (NULL);
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if (__predict_false(unp == unp2))
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return (unp);
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UNP_PCB_UNLOCK_ASSERT(unp2);
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if (__predict_true(UNP_PCB_TRYLOCK(unp2)))
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return (unp2);
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if ((uintptr_t)unp2 > (uintptr_t)unp) {
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UNP_PCB_LOCK(unp2);
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return (unp2);
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}
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unp->unp_pairbusy++;
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unp_pcb_hold(unp2);
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UNP_PCB_UNLOCK(unp);
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UNP_PCB_LOCK(unp2);
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UNP_PCB_LOCK(unp);
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KASSERT(unp->unp_conn == unp2 || unp->unp_conn == NULL,
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("%s: socket %p was reconnected", __func__, unp));
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if (--unp->unp_pairbusy == 0 && (unp->unp_flags & UNP_WAITING) != 0) {
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unp->unp_flags &= ~UNP_WAITING;
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wakeup(unp);
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}
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if (unp_pcb_rele(unp2)) {
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/* unp2 is unlocked. */
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return (NULL);
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}
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if (unp->unp_conn == NULL) {
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UNP_PCB_UNLOCK(unp2);
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return (NULL);
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}
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return (unp2);
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}
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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_PCB_UNLOCK_ASSERT(unp);
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UNP_PCB_LOCK(unp);
|
|
unp2 = unp->unp_conn;
|
|
if (unp2 != NULL) {
|
|
unp_pcb_hold(unp2);
|
|
UNP_PCB_UNLOCK(unp);
|
|
unp_drop(unp2);
|
|
} else
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
|
|
static int
|
|
uipc_accept(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
const struct sockaddr *sa;
|
|
|
|
/*
|
|
* Pass back name of connected socket, if it was bound and we are
|
|
* still connected (our peer may have closed already!).
|
|
*/
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
|
|
|
|
*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = unp_pcb_lock_peer(unp);
|
|
if (unp2 != NULL && unp2->unp_addr != NULL)
|
|
sa = (struct sockaddr *)unp2->unp_addr;
|
|
else
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
if (unp2 != NULL)
|
|
unp_pcb_unlock_pair(unp, unp2);
|
|
else
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
u_long sendspace, recvspace;
|
|
struct unpcb *unp;
|
|
int error;
|
|
bool locked;
|
|
|
|
KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
switch (so->so_type) {
|
|
case SOCK_STREAM:
|
|
sendspace = unpst_sendspace;
|
|
recvspace = unpst_recvspace;
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
STAILQ_INIT(&so->so_rcv.uxdg_mb);
|
|
STAILQ_INIT(&so->so_snd.uxdg_mb);
|
|
TAILQ_INIT(&so->so_rcv.uxdg_conns);
|
|
/*
|
|
* Since send buffer is either bypassed or is a part
|
|
* of one-to-many receive buffer, we assign both space
|
|
* limits to unpdg_recvspace.
|
|
*/
|
|
sendspace = recvspace = unpdg_recvspace;
|
|
break;
|
|
|
|
case SOCK_SEQPACKET:
|
|
sendspace = unpsp_sendspace;
|
|
recvspace = unpsp_recvspace;
|
|
break;
|
|
|
|
default:
|
|
panic("uipc_attach");
|
|
}
|
|
error = soreserve(so, sendspace, recvspace);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
|
|
if (unp == NULL)
|
|
return (ENOBUFS);
|
|
LIST_INIT(&unp->unp_refs);
|
|
UNP_PCB_LOCK_INIT(unp);
|
|
unp->unp_socket = so;
|
|
so->so_pcb = unp;
|
|
refcount_init(&unp->unp_refcount, 1);
|
|
|
|
if ((locked = UNP_LINK_WOWNED()) == false)
|
|
UNP_LINK_WLOCK();
|
|
|
|
unp->unp_gencnt = ++unp_gencnt;
|
|
unp->unp_ino = ++unp_ino;
|
|
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");
|
|
}
|
|
|
|
if (locked == false)
|
|
UNP_LINK_WUNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
|
|
struct vattr vattr;
|
|
int error, namelen;
|
|
struct nameidata nd;
|
|
struct unpcb *unp;
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
cap_rights_t rights;
|
|
char *buf;
|
|
|
|
if (nam->sa_family != AF_UNIX)
|
|
return (EAFNOSUPPORT);
|
|
|
|
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:
|
|
NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | NOCACHE,
|
|
UIO_SYSSPACE, buf, fd, cap_rights_init_one(&rights, CAP_BINDAT));
|
|
/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
|
|
error = namei(&nd);
|
|
if (error)
|
|
goto error;
|
|
vp = nd.ni_vp;
|
|
if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
|
|
NDFREE_PNBUF(&nd);
|
|
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 | V_PCATCH);
|
|
if (error)
|
|
goto error;
|
|
goto restart;
|
|
}
|
|
VATTR_NULL(&vattr);
|
|
vattr.va_type = VSOCK;
|
|
vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_pd->pd_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_PNBUF(&nd);
|
|
if (error) {
|
|
VOP_VPUT_PAIR(nd.ni_dvp, NULL, true);
|
|
vn_finished_write(mp);
|
|
if (error == ERELOOKUP)
|
|
goto restart;
|
|
goto error;
|
|
}
|
|
vp = nd.ni_vp;
|
|
ASSERT_VOP_ELOCKED(vp, "uipc_bind");
|
|
soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
VOP_UNP_BIND(vp, unp);
|
|
unp->unp_vnode = vp;
|
|
unp->unp_addr = soun;
|
|
unp->unp_flags &= ~UNP_BINDING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
vref(vp);
|
|
VOP_VPUT_PAIR(nd.ni_dvp, &vp, true);
|
|
vn_finished_write(mp);
|
|
free(buf, M_TEMP);
|
|
return (0);
|
|
|
|
error:
|
|
UNP_PCB_LOCK(unp);
|
|
unp->unp_flags &= ~UNP_BINDING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
free(buf, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
|
|
return (uipc_bindat(AT_FDCWD, so, nam, td));
|
|
}
|
|
|
|
static int
|
|
uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
KASSERT(td == curthread, ("uipc_connect: td != curthread"));
|
|
error = unp_connect(so, nam, td);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
|
|
KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
|
|
error = unp_connectat(fd, so, nam, td, false);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
uipc_close(struct socket *so)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct vnode *vp = NULL;
|
|
struct mtx *vplock;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
|
|
|
|
vplock = NULL;
|
|
if ((vp = unp->unp_vnode) != NULL) {
|
|
vplock = mtx_pool_find(mtxpool_sleep, vp);
|
|
mtx_lock(vplock);
|
|
}
|
|
UNP_PCB_LOCK(unp);
|
|
if (vp && unp->unp_vnode == NULL) {
|
|
mtx_unlock(vplock);
|
|
vp = NULL;
|
|
}
|
|
if (vp != NULL) {
|
|
VOP_UNP_DETACH(vp);
|
|
unp->unp_vnode = NULL;
|
|
}
|
|
if ((unp2 = unp_pcb_lock_peer(unp)) != NULL)
|
|
unp_disconnect(unp, unp2);
|
|
else
|
|
UNP_PCB_UNLOCK(unp);
|
|
if (vp) {
|
|
mtx_unlock(vplock);
|
|
vrele(vp);
|
|
}
|
|
}
|
|
|
|
static int
|
|
uipc_connect2(struct socket *so1, struct socket *so2)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
|
|
if (so1->so_type != so2->so_type)
|
|
return (EPROTOTYPE);
|
|
|
|
unp = so1->so_pcb;
|
|
KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
|
|
unp2 = so2->so_pcb;
|
|
KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
|
|
unp_pcb_lock_pair(unp, unp2);
|
|
unp_connect2(so1, so2, PRU_CONNECT2);
|
|
unp_pcb_unlock_pair(unp, unp2);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
uipc_detach(struct socket *so)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct mtx *vplock;
|
|
struct vnode *vp;
|
|
int local_unp_rights;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
|
|
|
|
vp = NULL;
|
|
vplock = NULL;
|
|
|
|
UNP_LINK_WLOCK();
|
|
LIST_REMOVE(unp, unp_link);
|
|
if (unp->unp_gcflag & UNPGC_DEAD)
|
|
LIST_REMOVE(unp, unp_dead);
|
|
unp->unp_gencnt = ++unp_gencnt;
|
|
--unp_count;
|
|
UNP_LINK_WUNLOCK();
|
|
|
|
UNP_PCB_UNLOCK_ASSERT(unp);
|
|
restart:
|
|
if ((vp = unp->unp_vnode) != NULL) {
|
|
vplock = mtx_pool_find(mtxpool_sleep, vp);
|
|
mtx_lock(vplock);
|
|
}
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_vnode != vp && unp->unp_vnode != NULL) {
|
|
if (vplock)
|
|
mtx_unlock(vplock);
|
|
UNP_PCB_UNLOCK(unp);
|
|
goto restart;
|
|
}
|
|
if ((vp = unp->unp_vnode) != NULL) {
|
|
VOP_UNP_DETACH(vp);
|
|
unp->unp_vnode = NULL;
|
|
}
|
|
if ((unp2 = unp_pcb_lock_peer(unp)) != NULL)
|
|
unp_disconnect(unp, unp2);
|
|
else
|
|
UNP_PCB_UNLOCK(unp);
|
|
|
|
UNP_REF_LIST_LOCK();
|
|
while (!LIST_EMPTY(&unp->unp_refs)) {
|
|
struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
|
|
|
|
unp_pcb_hold(ref);
|
|
UNP_REF_LIST_UNLOCK();
|
|
|
|
MPASS(ref != unp);
|
|
UNP_PCB_UNLOCK_ASSERT(ref);
|
|
unp_drop(ref);
|
|
UNP_REF_LIST_LOCK();
|
|
}
|
|
UNP_REF_LIST_UNLOCK();
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
local_unp_rights = unp_rights;
|
|
unp->unp_socket->so_pcb = NULL;
|
|
unp->unp_socket = NULL;
|
|
free(unp->unp_addr, M_SONAME);
|
|
unp->unp_addr = NULL;
|
|
if (!unp_pcb_rele(unp))
|
|
UNP_PCB_UNLOCK(unp);
|
|
if (vp) {
|
|
mtx_unlock(vplock);
|
|
vrele(vp);
|
|
}
|
|
if (local_unp_rights)
|
|
taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
|
|
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
/*
|
|
* Everything should have been unlinked/freed by unp_dispose()
|
|
* and/or unp_disconnect().
|
|
*/
|
|
MPASS(so->so_rcv.uxdg_peeked == NULL);
|
|
MPASS(STAILQ_EMPTY(&so->so_rcv.uxdg_mb));
|
|
MPASS(TAILQ_EMPTY(&so->so_rcv.uxdg_conns));
|
|
MPASS(STAILQ_EMPTY(&so->so_snd.uxdg_mb));
|
|
}
|
|
}
|
|
|
|
static int
|
|
uipc_disconnect(struct socket *so)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
if ((unp2 = unp_pcb_lock_peer(unp)) != NULL)
|
|
unp_disconnect(unp, unp2);
|
|
else
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_listen(struct socket *so, int backlog, struct thread *td)
|
|
{
|
|
struct unpcb *unp;
|
|
int error;
|
|
|
|
MPASS(so->so_type != SOCK_DGRAM);
|
|
|
|
/*
|
|
* Synchronize with concurrent connection attempts.
|
|
*/
|
|
error = 0;
|
|
unp = sotounpcb(so);
|
|
UNP_PCB_LOCK(unp);
|
|
if (unp->unp_conn != NULL || (unp->unp_flags & UNP_CONNECTING) != 0)
|
|
error = EINVAL;
|
|
else if (unp->unp_vnode == NULL)
|
|
error = EDESTADDRREQ;
|
|
if (error != 0) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (error);
|
|
}
|
|
|
|
SOCK_LOCK(so);
|
|
error = solisten_proto_check(so);
|
|
if (error == 0) {
|
|
cru2xt(td, &unp->unp_peercred);
|
|
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_PCB_LOCK(unp);
|
|
unp2 = unp_pcb_lock_peer(unp);
|
|
if (unp2 != NULL) {
|
|
if (unp2->unp_addr != NULL)
|
|
sa = (struct sockaddr *)unp2->unp_addr;
|
|
else
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
unp_pcb_unlock_pair(unp, unp2);
|
|
} else {
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_rcvd(struct socket *so, int flags)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct socket *so2;
|
|
u_int mbcnt, sbcc;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
|
|
KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET,
|
|
("%s: socktype %d", __func__, 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 = sbavail(&so->so_rcv);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
/*
|
|
* There is a benign race condition at this point. If we're planning to
|
|
* clear SB_STOP, but uipc_send is called on the connected socket at
|
|
* this instant, it might add data to the sockbuf and set SB_STOP. Then
|
|
* we would erroneously clear SB_STOP below, even though the sockbuf is
|
|
* full. The race is benign because the only ill effect is to allow the
|
|
* sockbuf to exceed its size limit, and the size limits are not
|
|
* strictly guaranteed anyway.
|
|
*/
|
|
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);
|
|
if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
|
|
so2->so_snd.sb_flags &= ~SB_STOP;
|
|
sowwakeup_locked(so2);
|
|
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, sbcc;
|
|
int error;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
|
|
KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET,
|
|
("%s: socktype %d", __func__, so->so_type));
|
|
|
|
error = 0;
|
|
if (flags & PRUS_OOB) {
|
|
error = EOPNOTSUPP;
|
|
goto release;
|
|
}
|
|
if (control != NULL &&
|
|
(error = unp_internalize(&control, td, NULL, NULL, NULL)))
|
|
goto release;
|
|
|
|
unp2 = NULL;
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
if (nam != NULL) {
|
|
if ((error = unp_connect(so, nam, td)) != 0)
|
|
goto out;
|
|
} else {
|
|
error = ENOTCONN;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
if ((unp2 = unp_pcb_lock_peer(unp)) == NULL) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
error = ENOTCONN;
|
|
goto out;
|
|
} else if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
unp_pcb_unlock_pair(unp, unp2);
|
|
error = EPIPE;
|
|
goto out;
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
if ((so2 = unp2->unp_socket) == NULL) {
|
|
UNP_PCB_UNLOCK(unp2);
|
|
error = ENOTCONN;
|
|
goto out;
|
|
}
|
|
SOCKBUF_LOCK(&so2->so_rcv);
|
|
if (unp2->unp_flags & UNP_WANTCRED_MASK) {
|
|
/*
|
|
* Credentials are passed only once on SOCK_STREAM and
|
|
* SOCK_SEQPACKET (LOCAL_CREDS => WANTCRED_ONESHOT), or
|
|
* forever (LOCAL_CREDS_PERSISTENT => WANTCRED_ALWAYS).
|
|
*/
|
|
control = unp_addsockcred(td, control, unp2->unp_flags, NULL,
|
|
NULL, NULL);
|
|
unp2->unp_flags &= ~UNP_WANTCRED_ONESHOT;
|
|
}
|
|
|
|
/*
|
|
* Send to paired receive port and wake up readers. Don't
|
|
* check for space available in the receive buffer if we're
|
|
* attaching ancillary data; Unix domain sockets only check
|
|
* for space in the sending sockbuf, and that check is
|
|
* performed one level up the stack. At that level we cannot
|
|
* precisely account for the amount of buffer space used
|
|
* (e.g., because control messages are not yet internalized).
|
|
*/
|
|
switch (so->so_type) {
|
|
case SOCK_STREAM:
|
|
if (control != NULL) {
|
|
sbappendcontrol_locked(&so2->so_rcv, m,
|
|
control, flags);
|
|
control = NULL;
|
|
} else
|
|
sbappend_locked(&so2->so_rcv, m, flags);
|
|
break;
|
|
|
|
case SOCK_SEQPACKET:
|
|
if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
|
|
&sun_noname, m, control))
|
|
control = NULL;
|
|
break;
|
|
}
|
|
|
|
mbcnt = so2->so_rcv.sb_mbcnt;
|
|
sbcc = sbavail(&so2->so_rcv);
|
|
if (sbcc)
|
|
sorwakeup_locked(so2);
|
|
else
|
|
SOCKBUF_UNLOCK(&so2->so_rcv);
|
|
|
|
/*
|
|
* The PCB lock on unp2 protects the SB_STOP flag. Without it,
|
|
* it would be possible for uipc_rcvd to be called at this
|
|
* point, drain the receiving sockbuf, clear SB_STOP, and then
|
|
* we would set SB_STOP below. That could lead to an empty
|
|
* sockbuf having SB_STOP set
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
|
|
so->so_snd.sb_flags |= SB_STOP;
|
|
SOCKBUF_UNLOCK(&so->so_snd);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
m = NULL;
|
|
out:
|
|
/*
|
|
* PRUS_EOF is equivalent to pr_send followed by pr_shutdown.
|
|
*/
|
|
if (flags & PRUS_EOF) {
|
|
UNP_PCB_LOCK(unp);
|
|
socantsendmore(so);
|
|
unp_shutdown(unp);
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
if (control != NULL && error != 0)
|
|
unp_scan(control, unp_freerights);
|
|
|
|
release:
|
|
if (control != NULL)
|
|
m_freem(control);
|
|
/*
|
|
* In case of PRUS_NOTREADY, uipc_ready() is responsible
|
|
* for freeing memory.
|
|
*/
|
|
if (m != NULL && (flags & PRUS_NOTREADY) == 0)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
/* PF_UNIX/SOCK_DGRAM version of sbspace() */
|
|
static inline bool
|
|
uipc_dgram_sbspace(struct sockbuf *sb, u_int cc, u_int mbcnt)
|
|
{
|
|
u_int bleft, mleft;
|
|
|
|
/*
|
|
* Negative space may happen if send(2) is followed by
|
|
* setsockopt(SO_SNDBUF/SO_RCVBUF) that shrinks maximum.
|
|
*/
|
|
if (__predict_false(sb->sb_hiwat < sb->uxdg_cc ||
|
|
sb->sb_mbmax < sb->uxdg_mbcnt))
|
|
return (false);
|
|
|
|
if (__predict_false(sb->sb_state & SBS_CANTRCVMORE))
|
|
return (false);
|
|
|
|
bleft = sb->sb_hiwat - sb->uxdg_cc;
|
|
mleft = sb->sb_mbmax - sb->uxdg_mbcnt;
|
|
|
|
return (bleft >= cc && mleft >= mbcnt);
|
|
}
|
|
|
|
/*
|
|
* PF_UNIX/SOCK_DGRAM send
|
|
*
|
|
* Allocate a record consisting of 3 mbufs in the sequence of
|
|
* from -> control -> data and append it to the socket buffer.
|
|
*
|
|
* The first mbuf carries sender's name and is a pkthdr that stores
|
|
* overall length of datagram, its memory consumption and control length.
|
|
*/
|
|
#define ctllen PH_loc.thirtytwo[1]
|
|
_Static_assert(offsetof(struct pkthdr, memlen) + sizeof(u_int) <=
|
|
offsetof(struct pkthdr, ctllen), "unix/dgram can not store ctllen");
|
|
static int
|
|
uipc_sosend_dgram(struct socket *so, struct sockaddr *addr, struct uio *uio,
|
|
struct mbuf *m, struct mbuf *c, int flags, struct thread *td)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
const struct sockaddr *from;
|
|
struct socket *so2;
|
|
struct sockbuf *sb;
|
|
struct mbuf *f, *clast;
|
|
u_int cc, ctl, mbcnt;
|
|
u_int dcc __diagused, dctl __diagused, dmbcnt __diagused;
|
|
int error;
|
|
|
|
MPASS((uio != NULL && m == NULL) || (m != NULL && uio == NULL));
|
|
|
|
error = 0;
|
|
f = NULL;
|
|
ctl = 0;
|
|
|
|
if (__predict_false(flags & MSG_OOB)) {
|
|
error = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
if (m == NULL) {
|
|
if (__predict_false(uio->uio_resid > unpdg_maxdgram)) {
|
|
error = EMSGSIZE;
|
|
goto out;
|
|
}
|
|
m = m_uiotombuf(uio, M_WAITOK, 0, max_hdr, M_PKTHDR);
|
|
if (__predict_false(m == NULL)) {
|
|
error = EFAULT;
|
|
goto out;
|
|
}
|
|
f = m_gethdr(M_WAITOK, MT_SONAME);
|
|
cc = m->m_pkthdr.len;
|
|
mbcnt = MSIZE + m->m_pkthdr.memlen;
|
|
if (c != NULL &&
|
|
(error = unp_internalize(&c, td, &clast, &ctl, &mbcnt)))
|
|
goto out;
|
|
} else {
|
|
/* pr_sosend() with mbuf usually is a kernel thread. */
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
if (__predict_false(c != NULL))
|
|
panic("%s: control from a kernel thread", __func__);
|
|
|
|
if (__predict_false(m->m_pkthdr.len > unpdg_maxdgram)) {
|
|
error = EMSGSIZE;
|
|
goto out;
|
|
}
|
|
if ((f = m_gethdr(M_NOWAIT, MT_SONAME)) == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
/* Condition the foreign mbuf to our standards. */
|
|
m_clrprotoflags(m);
|
|
m_tag_delete_chain(m, NULL);
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_pkthdr.flowid = 0;
|
|
m->m_pkthdr.csum_flags = 0;
|
|
m->m_pkthdr.fibnum = 0;
|
|
m->m_pkthdr.rsstype = 0;
|
|
|
|
cc = m->m_pkthdr.len;
|
|
mbcnt = MSIZE;
|
|
for (struct mbuf *mb = m; mb != NULL; mb = mb->m_next) {
|
|
mbcnt += MSIZE;
|
|
if (mb->m_flags & M_EXT)
|
|
mbcnt += mb->m_ext.ext_size;
|
|
}
|
|
}
|
|
|
|
unp = sotounpcb(so);
|
|
MPASS(unp);
|
|
|
|
/*
|
|
* XXXGL: would be cool to fully remove so_snd out of the equation
|
|
* and avoid this lock, which is not only extraneous, but also being
|
|
* released, thus still leaving possibility for a race. We can easily
|
|
* handle SBS_CANTSENDMORE/SS_ISCONNECTED complement in unpcb, but it
|
|
* is more difficult to invent something to handle so_error.
|
|
*/
|
|
error = SOCK_IO_SEND_LOCK(so, SBLOCKWAIT(flags));
|
|
if (error)
|
|
goto out2;
|
|
SOCK_SENDBUF_LOCK(so);
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
SOCK_SENDBUF_UNLOCK(so);
|
|
error = EPIPE;
|
|
goto out3;
|
|
}
|
|
if (so->so_error != 0) {
|
|
error = so->so_error;
|
|
so->so_error = 0;
|
|
SOCK_SENDBUF_UNLOCK(so);
|
|
goto out3;
|
|
}
|
|
if (((so->so_state & SS_ISCONNECTED) == 0) && addr == NULL) {
|
|
SOCK_SENDBUF_UNLOCK(so);
|
|
error = EDESTADDRREQ;
|
|
goto out3;
|
|
}
|
|
SOCK_SENDBUF_UNLOCK(so);
|
|
|
|
if (addr != NULL) {
|
|
if ((error = unp_connectat(AT_FDCWD, so, addr, td, true)))
|
|
goto out3;
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
unp2 = unp->unp_conn;
|
|
UNP_PCB_LOCK_ASSERT(unp2);
|
|
} else {
|
|
UNP_PCB_LOCK(unp);
|
|
unp2 = unp_pcb_lock_peer(unp);
|
|
if (unp2 == NULL) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
error = ENOTCONN;
|
|
goto out3;
|
|
}
|
|
}
|
|
|
|
if (unp2->unp_flags & UNP_WANTCRED_MASK)
|
|
c = unp_addsockcred(td, c, unp2->unp_flags, &clast, &ctl,
|
|
&mbcnt);
|
|
if (unp->unp_addr != NULL)
|
|
from = (struct sockaddr *)unp->unp_addr;
|
|
else
|
|
from = &sun_noname;
|
|
f->m_len = from->sa_len;
|
|
MPASS(from->sa_len <= MLEN);
|
|
bcopy(from, mtod(f, void *), from->sa_len);
|
|
ctl += f->m_len;
|
|
|
|
/*
|
|
* Concatenate mbufs: from -> control -> data.
|
|
* Save overall cc and mbcnt in "from" mbuf.
|
|
*/
|
|
if (c != NULL) {
|
|
#ifdef INVARIANTS
|
|
struct mbuf *mc;
|
|
|
|
for (mc = c; mc->m_next != NULL; mc = mc->m_next);
|
|
MPASS(mc == clast);
|
|
#endif
|
|
f->m_next = c;
|
|
clast->m_next = m;
|
|
c = NULL;
|
|
} else
|
|
f->m_next = m;
|
|
m = NULL;
|
|
#ifdef INVARIANTS
|
|
dcc = dctl = dmbcnt = 0;
|
|
for (struct mbuf *mb = f; mb != NULL; mb = mb->m_next) {
|
|
if (mb->m_type == MT_DATA)
|
|
dcc += mb->m_len;
|
|
else
|
|
dctl += mb->m_len;
|
|
dmbcnt += MSIZE;
|
|
if (mb->m_flags & M_EXT)
|
|
dmbcnt += mb->m_ext.ext_size;
|
|
}
|
|
MPASS(dcc == cc);
|
|
MPASS(dctl == ctl);
|
|
MPASS(dmbcnt == mbcnt);
|
|
#endif
|
|
f->m_pkthdr.len = cc + ctl;
|
|
f->m_pkthdr.memlen = mbcnt;
|
|
f->m_pkthdr.ctllen = ctl;
|
|
|
|
/*
|
|
* Destination socket buffer selection.
|
|
*
|
|
* Unconnected sends, when !(so->so_state & SS_ISCONNECTED) and the
|
|
* destination address is supplied, create a temporary connection for
|
|
* the run time of the function (see call to unp_connectat() above and
|
|
* to unp_disconnect() below). We distinguish them by condition of
|
|
* (addr != NULL). We intentionally avoid adding 'bool connected' for
|
|
* that condition, since, again, through the run time of this code we
|
|
* are always connected. For such "unconnected" sends, the destination
|
|
* buffer would be the receive buffer of destination socket so2.
|
|
*
|
|
* For connected sends, data lands on the send buffer of the sender's
|
|
* socket "so". Then, if we just added the very first datagram
|
|
* on this send buffer, we need to add the send buffer on to the
|
|
* receiving socket's buffer list. We put ourselves on top of the
|
|
* list. Such logic gives infrequent senders priority over frequent
|
|
* senders.
|
|
*
|
|
* Note on byte count management. As long as event methods kevent(2),
|
|
* select(2) are not protocol specific (yet), we need to maintain
|
|
* meaningful values on the receive buffer. So, the receive buffer
|
|
* would accumulate counters from all connected buffers potentially
|
|
* having sb_ccc > sb_hiwat or sb_mbcnt > sb_mbmax.
|
|
*/
|
|
so2 = unp2->unp_socket;
|
|
sb = (addr == NULL) ? &so->so_snd : &so2->so_rcv;
|
|
SOCK_RECVBUF_LOCK(so2);
|
|
if (uipc_dgram_sbspace(sb, cc + ctl, mbcnt)) {
|
|
if (addr == NULL && STAILQ_EMPTY(&sb->uxdg_mb))
|
|
TAILQ_INSERT_HEAD(&so2->so_rcv.uxdg_conns, &so->so_snd,
|
|
uxdg_clist);
|
|
STAILQ_INSERT_TAIL(&sb->uxdg_mb, f, m_stailqpkt);
|
|
sb->uxdg_cc += cc + ctl;
|
|
sb->uxdg_ctl += ctl;
|
|
sb->uxdg_mbcnt += mbcnt;
|
|
so2->so_rcv.sb_acc += cc + ctl;
|
|
so2->so_rcv.sb_ccc += cc + ctl;
|
|
so2->so_rcv.sb_ctl += ctl;
|
|
so2->so_rcv.sb_mbcnt += mbcnt;
|
|
sorwakeup_locked(so2);
|
|
f = NULL;
|
|
} else {
|
|
soroverflow_locked(so2);
|
|
error = ENOBUFS;
|
|
if (f->m_next->m_type == MT_CONTROL)
|
|
unp_scan(f->m_next, unp_freerights);
|
|
}
|
|
|
|
if (addr != NULL)
|
|
unp_disconnect(unp, unp2);
|
|
else
|
|
unp_pcb_unlock_pair(unp, unp2);
|
|
|
|
td->td_ru.ru_msgsnd++;
|
|
|
|
out3:
|
|
SOCK_IO_SEND_UNLOCK(so);
|
|
out2:
|
|
if (c)
|
|
unp_scan(c, unp_freerights);
|
|
out:
|
|
if (f)
|
|
m_freem(f);
|
|
if (c)
|
|
m_freem(c);
|
|
if (m)
|
|
m_freem(m);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* PF_UNIX/SOCK_DGRAM receive with MSG_PEEK.
|
|
* The mbuf has already been unlinked from the uxdg_mb of socket buffer
|
|
* and needs to be linked onto uxdg_peeked of receive socket buffer.
|
|
*/
|
|
static int
|
|
uipc_peek_dgram(struct socket *so, struct mbuf *m, struct sockaddr **psa,
|
|
struct uio *uio, struct mbuf **controlp, int *flagsp)
|
|
{
|
|
ssize_t len = 0;
|
|
int error;
|
|
|
|
so->so_rcv.uxdg_peeked = m;
|
|
so->so_rcv.uxdg_cc += m->m_pkthdr.len;
|
|
so->so_rcv.uxdg_ctl += m->m_pkthdr.ctllen;
|
|
so->so_rcv.uxdg_mbcnt += m->m_pkthdr.memlen;
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
|
|
KASSERT(m->m_type == MT_SONAME, ("m->m_type == %d", m->m_type));
|
|
if (psa != NULL)
|
|
*psa = sodupsockaddr(mtod(m, struct sockaddr *), M_WAITOK);
|
|
|
|
m = m->m_next;
|
|
KASSERT(m, ("%s: no data or control after soname", __func__));
|
|
|
|
/*
|
|
* With MSG_PEEK the control isn't executed, just copied.
|
|
*/
|
|
while (m != NULL && m->m_type == MT_CONTROL) {
|
|
if (controlp != NULL) {
|
|
*controlp = m_copym(m, 0, m->m_len, M_WAITOK);
|
|
controlp = &(*controlp)->m_next;
|
|
}
|
|
m = m->m_next;
|
|
}
|
|
KASSERT(m == NULL || m->m_type == MT_DATA,
|
|
("%s: not MT_DATA mbuf %p", __func__, m));
|
|
while (m != NULL && uio->uio_resid > 0) {
|
|
len = uio->uio_resid;
|
|
if (len > m->m_len)
|
|
len = m->m_len;
|
|
error = uiomove(mtod(m, char *), (int)len, uio);
|
|
if (error) {
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
return (error);
|
|
}
|
|
if (len == m->m_len)
|
|
m = m->m_next;
|
|
}
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
|
|
if (flagsp != NULL) {
|
|
if (m != NULL) {
|
|
if (*flagsp & MSG_TRUNC) {
|
|
/* Report real length of the packet */
|
|
uio->uio_resid -= m_length(m, NULL) - len;
|
|
}
|
|
*flagsp |= MSG_TRUNC;
|
|
} else
|
|
*flagsp &= ~MSG_TRUNC;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* PF_UNIX/SOCK_DGRAM receive
|
|
*/
|
|
static int
|
|
uipc_soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio,
|
|
struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
|
|
{
|
|
struct sockbuf *sb = NULL;
|
|
struct mbuf *m;
|
|
int flags, error;
|
|
ssize_t len = 0;
|
|
bool nonblock;
|
|
|
|
MPASS(mp0 == NULL);
|
|
|
|
if (psa != NULL)
|
|
*psa = NULL;
|
|
if (controlp != NULL)
|
|
*controlp = NULL;
|
|
|
|
flags = flagsp != NULL ? *flagsp : 0;
|
|
nonblock = (so->so_state & SS_NBIO) ||
|
|
(flags & (MSG_DONTWAIT | MSG_NBIO));
|
|
|
|
error = SOCK_IO_RECV_LOCK(so, SBLOCKWAIT(flags));
|
|
if (__predict_false(error))
|
|
return (error);
|
|
|
|
/*
|
|
* Loop blocking while waiting for a datagram. Prioritize connected
|
|
* peers over unconnected sends. Set sb to selected socket buffer
|
|
* containing an mbuf on exit from the wait loop. A datagram that
|
|
* had already been peeked at has top priority.
|
|
*/
|
|
SOCK_RECVBUF_LOCK(so);
|
|
while ((m = so->so_rcv.uxdg_peeked) == NULL &&
|
|
(sb = TAILQ_FIRST(&so->so_rcv.uxdg_conns)) == NULL &&
|
|
(m = STAILQ_FIRST(&so->so_rcv.uxdg_mb)) == NULL) {
|
|
if (so->so_error) {
|
|
error = so->so_error;
|
|
so->so_error = 0;
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
return (error);
|
|
}
|
|
if (so->so_rcv.sb_state & SBS_CANTRCVMORE ||
|
|
uio->uio_resid == 0) {
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
return (0);
|
|
}
|
|
if (nonblock) {
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
return (EWOULDBLOCK);
|
|
}
|
|
error = sbwait(so, SO_RCV);
|
|
if (error) {
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
if (sb == NULL)
|
|
sb = &so->so_rcv;
|
|
else if (m == NULL)
|
|
m = STAILQ_FIRST(&sb->uxdg_mb);
|
|
else
|
|
MPASS(m == so->so_rcv.uxdg_peeked);
|
|
|
|
MPASS(sb->uxdg_cc > 0);
|
|
M_ASSERTPKTHDR(m);
|
|
KASSERT(m->m_type == MT_SONAME, ("m->m_type == %d", m->m_type));
|
|
|
|
if (uio->uio_td)
|
|
uio->uio_td->td_ru.ru_msgrcv++;
|
|
|
|
if (__predict_true(m != so->so_rcv.uxdg_peeked)) {
|
|
STAILQ_REMOVE_HEAD(&sb->uxdg_mb, m_stailqpkt);
|
|
if (STAILQ_EMPTY(&sb->uxdg_mb) && sb != &so->so_rcv)
|
|
TAILQ_REMOVE(&so->so_rcv.uxdg_conns, sb, uxdg_clist);
|
|
} else
|
|
so->so_rcv.uxdg_peeked = NULL;
|
|
|
|
sb->uxdg_cc -= m->m_pkthdr.len;
|
|
sb->uxdg_ctl -= m->m_pkthdr.ctllen;
|
|
sb->uxdg_mbcnt -= m->m_pkthdr.memlen;
|
|
|
|
if (__predict_false(flags & MSG_PEEK))
|
|
return (uipc_peek_dgram(so, m, psa, uio, controlp, flagsp));
|
|
|
|
so->so_rcv.sb_acc -= m->m_pkthdr.len;
|
|
so->so_rcv.sb_ccc -= m->m_pkthdr.len;
|
|
so->so_rcv.sb_ctl -= m->m_pkthdr.ctllen;
|
|
so->so_rcv.sb_mbcnt -= m->m_pkthdr.memlen;
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
|
|
if (psa != NULL)
|
|
*psa = sodupsockaddr(mtod(m, struct sockaddr *), M_WAITOK);
|
|
m = m_free(m);
|
|
KASSERT(m, ("%s: no data or control after soname", __func__));
|
|
|
|
/*
|
|
* Packet to copyout() is now in 'm' and it is disconnected from the
|
|
* queue.
|
|
*
|
|
* Process one or more MT_CONTROL mbufs present before any data mbufs
|
|
* in the first mbuf chain on the socket buffer. We call into the
|
|
* unp_externalize() to perform externalization (or freeing if
|
|
* controlp == NULL). In some cases there can be only MT_CONTROL mbufs
|
|
* without MT_DATA mbufs.
|
|
*/
|
|
while (m != NULL && m->m_type == MT_CONTROL) {
|
|
struct mbuf *cm;
|
|
|
|
/* XXXGL: unp_externalize() is also dom_externalize() KBI and
|
|
* it frees whole chain, so we must disconnect the mbuf.
|
|
*/
|
|
cm = m; m = m->m_next; cm->m_next = NULL;
|
|
error = unp_externalize(cm, controlp, flags);
|
|
if (error != 0) {
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
unp_scan(m, unp_freerights);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
if (controlp != NULL) {
|
|
while (*controlp != NULL)
|
|
controlp = &(*controlp)->m_next;
|
|
}
|
|
}
|
|
KASSERT(m == NULL || m->m_type == MT_DATA,
|
|
("%s: not MT_DATA mbuf %p", __func__, m));
|
|
while (m != NULL && uio->uio_resid > 0) {
|
|
len = uio->uio_resid;
|
|
if (len > m->m_len)
|
|
len = m->m_len;
|
|
error = uiomove(mtod(m, char *), (int)len, uio);
|
|
if (error) {
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
if (len == m->m_len)
|
|
m = m_free(m);
|
|
else {
|
|
m->m_data += len;
|
|
m->m_len -= len;
|
|
}
|
|
}
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
|
|
if (m != NULL) {
|
|
if (flagsp != NULL) {
|
|
if (flags & MSG_TRUNC) {
|
|
/* Report real length of the packet */
|
|
uio->uio_resid -= m_length(m, NULL);
|
|
}
|
|
*flagsp |= MSG_TRUNC;
|
|
}
|
|
m_freem(m);
|
|
} else if (flagsp != NULL)
|
|
*flagsp &= ~MSG_TRUNC;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static bool
|
|
uipc_ready_scan(struct socket *so, struct mbuf *m, int count, int *errorp)
|
|
{
|
|
struct mbuf *mb, *n;
|
|
struct sockbuf *sb;
|
|
|
|
SOCK_LOCK(so);
|
|
if (SOLISTENING(so)) {
|
|
SOCK_UNLOCK(so);
|
|
return (false);
|
|
}
|
|
mb = NULL;
|
|
sb = &so->so_rcv;
|
|
SOCKBUF_LOCK(sb);
|
|
if (sb->sb_fnrdy != NULL) {
|
|
for (mb = sb->sb_mb, n = mb->m_nextpkt; mb != NULL;) {
|
|
if (mb == m) {
|
|
*errorp = sbready(sb, m, count);
|
|
break;
|
|
}
|
|
mb = mb->m_next;
|
|
if (mb == NULL) {
|
|
mb = n;
|
|
if (mb != NULL)
|
|
n = mb->m_nextpkt;
|
|
}
|
|
}
|
|
}
|
|
SOCKBUF_UNLOCK(sb);
|
|
SOCK_UNLOCK(so);
|
|
return (mb != NULL);
|
|
}
|
|
|
|
static int
|
|
uipc_ready(struct socket *so, struct mbuf *m, int count)
|
|
{
|
|
struct unpcb *unp, *unp2;
|
|
struct socket *so2;
|
|
int error, i;
|
|
|
|
unp = sotounpcb(so);
|
|
|
|
KASSERT(so->so_type == SOCK_STREAM,
|
|
("%s: unexpected socket type for %p", __func__, so));
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
if ((unp2 = unp_pcb_lock_peer(unp)) != NULL) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
so2 = unp2->unp_socket;
|
|
SOCKBUF_LOCK(&so2->so_rcv);
|
|
if ((error = sbready(&so2->so_rcv, m, count)) == 0)
|
|
sorwakeup_locked(so2);
|
|
else
|
|
SOCKBUF_UNLOCK(&so2->so_rcv);
|
|
UNP_PCB_UNLOCK(unp2);
|
|
return (error);
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
|
|
/*
|
|
* The receiving socket has been disconnected, but may still be valid.
|
|
* In this case, the now-ready mbufs are still present in its socket
|
|
* buffer, so perform an exhaustive search before giving up and freeing
|
|
* the mbufs.
|
|
*/
|
|
UNP_LINK_RLOCK();
|
|
LIST_FOREACH(unp, &unp_shead, unp_link) {
|
|
if (uipc_ready_scan(unp->unp_socket, m, count, &error))
|
|
break;
|
|
}
|
|
UNP_LINK_RUNLOCK();
|
|
|
|
if (unp == NULL) {
|
|
for (i = 0; i < count; i++)
|
|
m = m_free(m);
|
|
error = ECONNRESET;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_sense(struct socket *so, struct stat *sb)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
|
|
|
|
sb->st_blksize = so->so_snd.sb_hiwat;
|
|
sb->st_dev = NODEV;
|
|
sb->st_ino = unp->unp_ino;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_shutdown(struct socket *so)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
socantsendmore(so);
|
|
unp_shutdown(unp);
|
|
UNP_PCB_UNLOCK(unp);
|
|
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 int
|
|
uipc_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
struct unpcb *unp;
|
|
struct xucred xu;
|
|
int error, optval;
|
|
|
|
if (sopt->sopt_level != SOL_LOCAL)
|
|
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_ONESHOT ? 1 : 0;
|
|
error = sooptcopyout(sopt, &optval, sizeof(optval));
|
|
break;
|
|
|
|
case LOCAL_CREDS_PERSISTENT:
|
|
/* Unlocked read. */
|
|
optval = unp->unp_flags & UNP_WANTCRED_ALWAYS ? 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_CREDS_PERSISTENT:
|
|
case LOCAL_CONNWAIT:
|
|
error = sooptcopyin(sopt, &optval, sizeof(optval),
|
|
sizeof(optval));
|
|
if (error)
|
|
break;
|
|
|
|
#define OPTSET(bit, exclusive) do { \
|
|
UNP_PCB_LOCK(unp); \
|
|
if (optval) { \
|
|
if ((unp->unp_flags & (exclusive)) != 0) { \
|
|
UNP_PCB_UNLOCK(unp); \
|
|
error = EINVAL; \
|
|
break; \
|
|
} \
|
|
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_ONESHOT, UNP_WANTCRED_ALWAYS);
|
|
break;
|
|
|
|
case LOCAL_CREDS_PERSISTENT:
|
|
OPTSET(UNP_WANTCRED_ALWAYS, UNP_WANTCRED_ONESHOT);
|
|
break;
|
|
|
|
case LOCAL_CONNWAIT:
|
|
OPTSET(UNP_CONNWAIT, 0);
|
|
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)
|
|
{
|
|
|
|
return (unp_connectat(AT_FDCWD, so, nam, td, false));
|
|
}
|
|
|
|
static int
|
|
unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
|
|
struct thread *td, bool return_locked)
|
|
{
|
|
struct mtx *vplock;
|
|
struct sockaddr_un *soun;
|
|
struct vnode *vp;
|
|
struct socket *so2;
|
|
struct unpcb *unp, *unp2, *unp3;
|
|
struct nameidata nd;
|
|
char buf[SOCK_MAXADDRLEN];
|
|
struct sockaddr *sa;
|
|
cap_rights_t rights;
|
|
int error, len;
|
|
bool connreq;
|
|
|
|
if (nam->sa_family != AF_UNIX)
|
|
return (EAFNOSUPPORT);
|
|
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);
|
|
soun = (struct sockaddr_un *)nam;
|
|
bcopy(soun->sun_path, buf, len);
|
|
buf[len] = 0;
|
|
|
|
error = 0;
|
|
unp = sotounpcb(so);
|
|
UNP_PCB_LOCK(unp);
|
|
for (;;) {
|
|
/*
|
|
* Wait for connection state to stabilize. If a connection
|
|
* already exists, give up. For datagram sockets, which permit
|
|
* multiple consecutive connect(2) calls, upper layers are
|
|
* responsible for disconnecting in advance of a subsequent
|
|
* connect(2), but this is not synchronized with PCB connection
|
|
* state.
|
|
*
|
|
* Also make sure that no threads are currently attempting to
|
|
* lock the peer socket, to ensure that unp_conn cannot
|
|
* transition between two valid sockets while locks are dropped.
|
|
*/
|
|
if (SOLISTENING(so))
|
|
error = EOPNOTSUPP;
|
|
else if (unp->unp_conn != NULL)
|
|
error = EISCONN;
|
|
else if ((unp->unp_flags & UNP_CONNECTING) != 0) {
|
|
error = EALREADY;
|
|
}
|
|
if (error != 0) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
return (error);
|
|
}
|
|
if (unp->unp_pairbusy > 0) {
|
|
unp->unp_flags |= UNP_WAITING;
|
|
mtx_sleep(unp, UNP_PCB_LOCKPTR(unp), 0, "unpeer", 0);
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
unp->unp_flags |= UNP_CONNECTING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
|
|
connreq = (so->so_proto->pr_flags & PR_CONNREQUIRED) != 0;
|
|
if (connreq)
|
|
sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
else
|
|
sa = NULL;
|
|
NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
|
|
UIO_SYSSPACE, buf, fd, cap_rights_init_one(&rights, CAP_CONNECTAT));
|
|
error = namei(&nd);
|
|
if (error)
|
|
vp = NULL;
|
|
else
|
|
vp = nd.ni_vp;
|
|
ASSERT_VOP_LOCKED(vp, "unp_connect");
|
|
if (error)
|
|
goto bad;
|
|
NDFREE_PNBUF(&nd);
|
|
|
|
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;
|
|
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
|
|
|
|
vplock = mtx_pool_find(mtxpool_sleep, vp);
|
|
mtx_lock(vplock);
|
|
VOP_UNP_CONNECT(vp, &unp2);
|
|
if (unp2 == NULL) {
|
|
error = ECONNREFUSED;
|
|
goto bad2;
|
|
}
|
|
so2 = unp2->unp_socket;
|
|
if (so->so_type != so2->so_type) {
|
|
error = EPROTOTYPE;
|
|
goto bad2;
|
|
}
|
|
if (connreq) {
|
|
if (SOLISTENING(so2)) {
|
|
CURVNET_SET(so2->so_vnet);
|
|
so2 = sonewconn(so2, 0);
|
|
CURVNET_RESTORE();
|
|
} else
|
|
so2 = NULL;
|
|
if (so2 == NULL) {
|
|
error = ECONNREFUSED;
|
|
goto bad2;
|
|
}
|
|
unp3 = sotounpcb(so2);
|
|
unp_pcb_lock_pair(unp2, 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;
|
|
}
|
|
|
|
unp_copy_peercred(td, unp3, unp, unp2);
|
|
|
|
UNP_PCB_UNLOCK(unp2);
|
|
unp2 = unp3;
|
|
|
|
/*
|
|
* It is safe to block on the PCB lock here since unp2 is
|
|
* nascent and cannot be connected to any other sockets.
|
|
*/
|
|
UNP_PCB_LOCK(unp);
|
|
#ifdef MAC
|
|
mac_socketpeer_set_from_socket(so, so2);
|
|
mac_socketpeer_set_from_socket(so2, so);
|
|
#endif
|
|
} else {
|
|
unp_pcb_lock_pair(unp, unp2);
|
|
}
|
|
KASSERT(unp2 != NULL && so2 != NULL && unp2->unp_socket == so2 &&
|
|
sotounpcb(so2) == unp2,
|
|
("%s: unp2 %p so2 %p", __func__, unp2, so2));
|
|
unp_connect2(so, so2, PRU_CONNECT);
|
|
KASSERT((unp->unp_flags & UNP_CONNECTING) != 0,
|
|
("%s: unp %p has UNP_CONNECTING clear", __func__, unp));
|
|
unp->unp_flags &= ~UNP_CONNECTING;
|
|
if (!return_locked)
|
|
unp_pcb_unlock_pair(unp, unp2);
|
|
bad2:
|
|
mtx_unlock(vplock);
|
|
bad:
|
|
if (vp != NULL) {
|
|
/*
|
|
* If we are returning locked (called via uipc_sosend_dgram()),
|
|
* we need to be sure that vput() won't sleep. This is
|
|
* guaranteed by VOP_UNP_CONNECT() call above and unp2 lock.
|
|
* SOCK_STREAM/SEQPACKET can't request return_locked (yet).
|
|
*/
|
|
MPASS(!(return_locked && connreq));
|
|
vput(vp);
|
|
}
|
|
free(sa, M_SONAME);
|
|
if (__predict_false(error)) {
|
|
UNP_PCB_LOCK(unp);
|
|
KASSERT((unp->unp_flags & UNP_CONNECTING) != 0,
|
|
("%s: unp %p has UNP_CONNECTING clear", __func__, unp));
|
|
unp->unp_flags &= ~UNP_CONNECTING;
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Set socket peer credentials at connection time.
|
|
*
|
|
* The client's PCB credentials are copied from its process structure. The
|
|
* server's PCB credentials are copied from the socket on which it called
|
|
* listen(2). uipc_listen cached that process's credentials at the time.
|
|
*/
|
|
void
|
|
unp_copy_peercred(struct thread *td, struct unpcb *client_unp,
|
|
struct unpcb *server_unp, struct unpcb *listen_unp)
|
|
{
|
|
cru2xt(td, &client_unp->unp_peercred);
|
|
client_unp->unp_flags |= UNP_HAVEPC;
|
|
|
|
memcpy(&server_unp->unp_peercred, &listen_unp->unp_peercred,
|
|
sizeof(server_unp->unp_peercred));
|
|
server_unp->unp_flags |= UNP_HAVEPC;
|
|
client_unp->unp_flags |= (listen_unp->unp_flags & UNP_WANTCRED_MASK);
|
|
}
|
|
|
|
static void
|
|
unp_connect2(struct socket *so, struct socket *so2, conn2_how req)
|
|
{
|
|
struct unpcb *unp;
|
|
struct unpcb *unp2;
|
|
|
|
MPASS(so2->so_type == so->so_type);
|
|
unp = sotounpcb(so);
|
|
KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
|
|
unp2 = sotounpcb(so2);
|
|
KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
|
|
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
UNP_PCB_LOCK_ASSERT(unp2);
|
|
KASSERT(unp->unp_conn == NULL,
|
|
("%s: socket %p is already connected", __func__, unp));
|
|
|
|
unp->unp_conn = unp2;
|
|
unp_pcb_hold(unp2);
|
|
unp_pcb_hold(unp);
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
UNP_REF_LIST_LOCK();
|
|
LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
|
|
UNP_REF_LIST_UNLOCK();
|
|
soisconnected(so);
|
|
break;
|
|
|
|
case SOCK_STREAM:
|
|
case SOCK_SEQPACKET:
|
|
KASSERT(unp2->unp_conn == NULL,
|
|
("%s: socket %p is already connected", __func__, unp2));
|
|
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");
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
|
|
{
|
|
struct socket *so, *so2;
|
|
struct mbuf *m = NULL;
|
|
#ifdef INVARIANTS
|
|
struct unpcb *unptmp;
|
|
#endif
|
|
|
|
UNP_PCB_LOCK_ASSERT(unp);
|
|
UNP_PCB_LOCK_ASSERT(unp2);
|
|
KASSERT(unp->unp_conn == unp2,
|
|
("%s: unpcb %p is not connected to %p", __func__, unp, unp2));
|
|
|
|
unp->unp_conn = NULL;
|
|
so = unp->unp_socket;
|
|
so2 = unp2->unp_socket;
|
|
switch (unp->unp_socket->so_type) {
|
|
case SOCK_DGRAM:
|
|
/*
|
|
* Remove our send socket buffer from the peer's receive buffer.
|
|
* Move the data to the receive buffer only if it is empty.
|
|
* This is a protection against a scenario where a peer
|
|
* connects, floods and disconnects, effectively blocking
|
|
* sendto() from unconnected sockets.
|
|
*/
|
|
SOCK_RECVBUF_LOCK(so2);
|
|
if (!STAILQ_EMPTY(&so->so_snd.uxdg_mb)) {
|
|
TAILQ_REMOVE(&so2->so_rcv.uxdg_conns, &so->so_snd,
|
|
uxdg_clist);
|
|
if (__predict_true((so2->so_rcv.sb_state &
|
|
SBS_CANTRCVMORE) == 0) &&
|
|
STAILQ_EMPTY(&so2->so_rcv.uxdg_mb)) {
|
|
STAILQ_CONCAT(&so2->so_rcv.uxdg_mb,
|
|
&so->so_snd.uxdg_mb);
|
|
so2->so_rcv.uxdg_cc += so->so_snd.uxdg_cc;
|
|
so2->so_rcv.uxdg_ctl += so->so_snd.uxdg_ctl;
|
|
so2->so_rcv.uxdg_mbcnt += so->so_snd.uxdg_mbcnt;
|
|
} else {
|
|
m = STAILQ_FIRST(&so->so_snd.uxdg_mb);
|
|
STAILQ_INIT(&so->so_snd.uxdg_mb);
|
|
so2->so_rcv.sb_acc -= so->so_snd.uxdg_cc;
|
|
so2->so_rcv.sb_ccc -= so->so_snd.uxdg_cc;
|
|
so2->so_rcv.sb_ctl -= so->so_snd.uxdg_ctl;
|
|
so2->so_rcv.sb_mbcnt -= so->so_snd.uxdg_mbcnt;
|
|
}
|
|
/* Note: so may reconnect. */
|
|
so->so_snd.uxdg_cc = 0;
|
|
so->so_snd.uxdg_ctl = 0;
|
|
so->so_snd.uxdg_mbcnt = 0;
|
|
}
|
|
SOCK_RECVBUF_UNLOCK(so2);
|
|
UNP_REF_LIST_LOCK();
|
|
#ifdef INVARIANTS
|
|
LIST_FOREACH(unptmp, &unp2->unp_refs, unp_reflink) {
|
|
if (unptmp == unp)
|
|
break;
|
|
}
|
|
KASSERT(unptmp != NULL,
|
|
("%s: %p not found in reflist of %p", __func__, unp, unp2));
|
|
#endif
|
|
LIST_REMOVE(unp, unp_reflink);
|
|
UNP_REF_LIST_UNLOCK();
|
|
if (so) {
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED;
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
break;
|
|
|
|
case SOCK_STREAM:
|
|
case SOCK_SEQPACKET:
|
|
if (so)
|
|
soisdisconnected(so);
|
|
MPASS(unp2->unp_conn == unp);
|
|
unp2->unp_conn = NULL;
|
|
if (so2)
|
|
soisdisconnected(so2);
|
|
break;
|
|
}
|
|
|
|
if (unp == unp2) {
|
|
unp_pcb_rele_notlast(unp);
|
|
if (!unp_pcb_rele(unp))
|
|
UNP_PCB_UNLOCK(unp);
|
|
} else {
|
|
if (!unp_pcb_rele(unp))
|
|
UNP_PCB_UNLOCK(unp);
|
|
if (!unp_pcb_rele(unp2))
|
|
UNP_PCB_UNLOCK(unp2);
|
|
}
|
|
|
|
if (m != NULL) {
|
|
unp_scan(m, unp_freerights);
|
|
m_freem(m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct unpcb *unp, **unp_list;
|
|
unp_gen_t gencnt;
|
|
struct xunpgen *xug;
|
|
struct unp_head *head;
|
|
struct xunpcb *xu;
|
|
u_int i;
|
|
int error, n;
|
|
|
|
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 | M_ZERO);
|
|
UNP_LINK_RLOCK();
|
|
gencnt = unp_gencnt;
|
|
n = unp_count;
|
|
UNP_LINK_RUNLOCK();
|
|
|
|
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_LINK_RLOCK();
|
|
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_pcb_hold(unp);
|
|
}
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
UNP_LINK_RUNLOCK();
|
|
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);
|
|
if (unp_pcb_rele(unp))
|
|
continue;
|
|
|
|
if (unp->unp_gencnt <= gencnt) {
|
|
xu->xu_len = sizeof *xu;
|
|
xu->xu_unpp = (uintptr_t)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);
|
|
else
|
|
bzero(&xu->xu_addr, sizeof(xu->xu_addr));
|
|
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);
|
|
else
|
|
bzero(&xu->xu_caddr, sizeof(xu->xu_caddr));
|
|
xu->unp_vnode = (uintptr_t)unp->unp_vnode;
|
|
xu->unp_conn = (uintptr_t)unp->unp_conn;
|
|
xu->xu_firstref = (uintptr_t)LIST_FIRST(&unp->unp_refs);
|
|
xu->xu_nextref = (uintptr_t)LIST_NEXT(unp, unp_reflink);
|
|
xu->unp_gencnt = unp->unp_gencnt;
|
|
sotoxsocket(unp->unp_socket, &xu->xu_socket);
|
|
UNP_PCB_UNLOCK(unp);
|
|
error = SYSCTL_OUT(req, xu, sizeof *xu);
|
|
} else {
|
|
UNP_PCB_UNLOCK(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 | CTLFLAG_MPSAFE,
|
|
(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 | CTLFLAG_MPSAFE,
|
|
(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 | CTLFLAG_MPSAFE,
|
|
(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_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)
|
|
{
|
|
struct socket *so;
|
|
struct unpcb *unp2;
|
|
|
|
/*
|
|
* Regardless of whether the socket's peer dropped the connection
|
|
* with this socket by aborting or disconnecting, POSIX requires
|
|
* that ECONNRESET is returned.
|
|
*/
|
|
|
|
UNP_PCB_LOCK(unp);
|
|
so = unp->unp_socket;
|
|
if (so)
|
|
so->so_error = ECONNRESET;
|
|
if ((unp2 = unp_pcb_lock_peer(unp)) != NULL) {
|
|
/* Last reference dropped in unp_disconnect(). */
|
|
unp_pcb_rele_notlast(unp);
|
|
unp_disconnect(unp, unp2);
|
|
} else if (!unp_pcb_rele(unp)) {
|
|
UNP_PCB_UNLOCK(unp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_freerights(struct filedescent **fdep, int fdcount)
|
|
{
|
|
struct file *fp;
|
|
int i;
|
|
|
|
KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
fp = fdep[i]->fde_file;
|
|
filecaps_free(&fdep[i]->fde_caps);
|
|
unp_discard(fp);
|
|
}
|
|
free(fdep[0], M_FILECAPS);
|
|
}
|
|
|
|
static int
|
|
unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
|
|
int i;
|
|
int *fdp;
|
|
struct filedesc *fdesc = td->td_proc->p_fd;
|
|
struct filedescent **fdep;
|
|
void *data;
|
|
socklen_t clen = control->m_len, datalen;
|
|
int error, newfds;
|
|
u_int newlen;
|
|
|
|
UNP_LINK_UNLOCK_ASSERT();
|
|
|
|
error = 0;
|
|
if (controlp != NULL) /* controlp == NULL => free control messages */
|
|
*controlp = NULL;
|
|
while (cm != NULL) {
|
|
MPASS(clen >= sizeof(*cm) && clen >= cm->cmsg_len);
|
|
|
|
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(*fdep);
|
|
if (newfds == 0)
|
|
goto next;
|
|
fdep = data;
|
|
|
|
/* If we're not outputting the descriptors free them. */
|
|
if (error || controlp == NULL) {
|
|
unp_freerights(fdep, newfds);
|
|
goto next;
|
|
}
|
|
FILEDESC_XLOCK(fdesc);
|
|
|
|
/*
|
|
* 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, M_WAITOK);
|
|
|
|
fdp = (int *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
if ((error = fdallocn(td, 0, fdp, newfds))) {
|
|
FILEDESC_XUNLOCK(fdesc);
|
|
unp_freerights(fdep, newfds);
|
|
m_freem(*controlp);
|
|
*controlp = NULL;
|
|
goto next;
|
|
}
|
|
for (i = 0; i < newfds; i++, fdp++) {
|
|
_finstall(fdesc, fdep[i]->fde_file, *fdp,
|
|
(flags & MSG_CMSG_CLOEXEC) != 0 ? O_CLOEXEC : 0,
|
|
&fdep[i]->fde_caps);
|
|
unp_externalize_fp(fdep[i]->fde_file);
|
|
}
|
|
|
|
/*
|
|
* The new type indicates that the mbuf data refers to
|
|
* kernel resources that may need to be released before
|
|
* the mbuf is freed.
|
|
*/
|
|
m_chtype(*controlp, MT_EXTCONTROL);
|
|
FILEDESC_XUNLOCK(fdesc);
|
|
free(fdep[0], M_FILECAPS);
|
|
} else {
|
|
/* We can just copy anything else across. */
|
|
if (error || controlp == NULL)
|
|
goto next;
|
|
*controlp = sbcreatecontrol(NULL, datalen,
|
|
cm->cmsg_type, cm->cmsg_level, M_WAITOK);
|
|
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);
|
|
}
|
|
|
|
#ifdef INVARIANTS
|
|
static void
|
|
unp_zdtor(void *mem, int size __unused, void *arg __unused)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
unp = mem;
|
|
|
|
KASSERT(LIST_EMPTY(&unp->unp_refs),
|
|
("%s: unpcb %p has lingering refs", __func__, unp));
|
|
KASSERT(unp->unp_socket == NULL,
|
|
("%s: unpcb %p has socket backpointer", __func__, unp));
|
|
KASSERT(unp->unp_vnode == NULL,
|
|
("%s: unpcb %p has vnode references", __func__, unp));
|
|
KASSERT(unp->unp_conn == NULL,
|
|
("%s: unpcb %p is still connected", __func__, unp));
|
|
KASSERT(unp->unp_addr == NULL,
|
|
("%s: unpcb %p has leaked addr", __func__, unp));
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
unp_init(void *arg __unused)
|
|
{
|
|
uma_dtor dtor;
|
|
|
|
#ifdef INVARIANTS
|
|
dtor = unp_zdtor;
|
|
#else
|
|
dtor = NULL;
|
|
#endif
|
|
unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, dtor,
|
|
NULL, NULL, UMA_ALIGN_CACHE, 0);
|
|
uma_zone_set_max(unp_zone, maxsockets);
|
|
uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
|
|
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);
|
|
TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
|
|
TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
|
|
UNP_LINK_LOCK_INIT();
|
|
UNP_DEFERRED_LOCK_INIT();
|
|
}
|
|
SYSINIT(unp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND, unp_init, NULL);
|
|
|
|
static void
|
|
unp_internalize_cleanup_rights(struct mbuf *control)
|
|
{
|
|
struct cmsghdr *cp;
|
|
struct mbuf *m;
|
|
void *data;
|
|
socklen_t datalen;
|
|
|
|
for (m = control; m != NULL; m = m->m_next) {
|
|
cp = mtod(m, struct cmsghdr *);
|
|
if (cp->cmsg_level != SOL_SOCKET ||
|
|
cp->cmsg_type != SCM_RIGHTS)
|
|
continue;
|
|
data = CMSG_DATA(cp);
|
|
datalen = (caddr_t)cp + cp->cmsg_len - (caddr_t)data;
|
|
unp_freerights(data, datalen / sizeof(struct filedesc *));
|
|
}
|
|
}
|
|
|
|
static int
|
|
unp_internalize(struct mbuf **controlp, struct thread *td,
|
|
struct mbuf **clast, u_int *space, u_int *mbcnt)
|
|
{
|
|
struct mbuf *control, **initial_controlp;
|
|
struct proc *p;
|
|
struct filedesc *fdesc;
|
|
struct bintime *bt;
|
|
struct cmsghdr *cm;
|
|
struct cmsgcred *cmcred;
|
|
struct filedescent *fde, **fdep, *fdev;
|
|
struct file *fp;
|
|
struct timeval *tv;
|
|
struct timespec *ts;
|
|
void *data;
|
|
socklen_t clen, datalen;
|
|
int i, j, error, *fdp, oldfds;
|
|
u_int newlen;
|
|
|
|
MPASS((*controlp)->m_next == NULL); /* COMPAT_OLDSOCK may violate */
|
|
UNP_LINK_UNLOCK_ASSERT();
|
|
|
|
p = td->td_proc;
|
|
fdesc = p->p_fd;
|
|
error = 0;
|
|
control = *controlp;
|
|
*controlp = NULL;
|
|
initial_controlp = controlp;
|
|
for (clen = control->m_len, cm = mtod(control, struct cmsghdr *),
|
|
data = CMSG_DATA(cm);
|
|
|
|
clen >= sizeof(*cm) && cm->cmsg_level == SOL_SOCKET &&
|
|
clen >= cm->cmsg_len && cm->cmsg_len >= sizeof(*cm) &&
|
|
(char *)cm + cm->cmsg_len >= (char *)data;
|
|
|
|
clen -= min(CMSG_SPACE(datalen), clen),
|
|
cm = (struct cmsghdr *) ((char *)cm + CMSG_SPACE(datalen)),
|
|
data = CMSG_DATA(cm)) {
|
|
datalen = (char *)cm + cm->cmsg_len - (char *)data;
|
|
switch (cm->cmsg_type) {
|
|
case SCM_CREDS:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
|
|
SCM_CREDS, SOL_SOCKET, M_WAITOK);
|
|
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);
|
|
if (oldfds == 0)
|
|
continue;
|
|
/* On some machines sizeof pointer is bigger than
|
|
* sizeof int, so we need to check if data fits into
|
|
* single mbuf. We could allocate several mbufs, and
|
|
* unp_externalize() should even properly handle that.
|
|
* But it is not worth to complicate the code for an
|
|
* insane scenario of passing over 200 file descriptors
|
|
* at once.
|
|
*/
|
|
newlen = oldfds * sizeof(fdep[0]);
|
|
if (CMSG_SPACE(newlen) > MCLBYTES) {
|
|
error = EMSGSIZE;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Check that all the FDs passed in refer to legal
|
|
* files. If not, reject the entire operation.
|
|
*/
|
|
fdp = data;
|
|
FILEDESC_SLOCK(fdesc);
|
|
for (i = 0; i < oldfds; i++, fdp++) {
|
|
fp = fget_noref(fdesc, *fdp);
|
|
if (fp == NULL) {
|
|
FILEDESC_SUNLOCK(fdesc);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
|
|
FILEDESC_SUNLOCK(fdesc);
|
|
error = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now replace the integer FDs with pointers to the
|
|
* file structure and capability rights.
|
|
*/
|
|
*controlp = sbcreatecontrol(NULL, newlen,
|
|
SCM_RIGHTS, SOL_SOCKET, M_WAITOK);
|
|
fdp = data;
|
|
for (i = 0; i < oldfds; i++, fdp++) {
|
|
if (!fhold(fdesc->fd_ofiles[*fdp].fde_file)) {
|
|
fdp = data;
|
|
for (j = 0; j < i; j++, fdp++) {
|
|
fdrop(fdesc->fd_ofiles[*fdp].
|
|
fde_file, td);
|
|
}
|
|
FILEDESC_SUNLOCK(fdesc);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
}
|
|
fdp = data;
|
|
fdep = (struct filedescent **)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
|
|
M_WAITOK);
|
|
for (i = 0; i < oldfds; i++, fdev++, fdp++) {
|
|
fde = &fdesc->fd_ofiles[*fdp];
|
|
fdep[i] = fdev;
|
|
fdep[i]->fde_file = fde->fde_file;
|
|
filecaps_copy(&fde->fde_caps,
|
|
&fdep[i]->fde_caps, true);
|
|
unp_internalize_fp(fdep[i]->fde_file);
|
|
}
|
|
FILEDESC_SUNLOCK(fdesc);
|
|
break;
|
|
|
|
case SCM_TIMESTAMP:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*tv),
|
|
SCM_TIMESTAMP, SOL_SOCKET, M_WAITOK);
|
|
tv = (struct timeval *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
microtime(tv);
|
|
break;
|
|
|
|
case SCM_BINTIME:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*bt),
|
|
SCM_BINTIME, SOL_SOCKET, M_WAITOK);
|
|
bt = (struct bintime *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
bintime(bt);
|
|
break;
|
|
|
|
case SCM_REALTIME:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*ts),
|
|
SCM_REALTIME, SOL_SOCKET, M_WAITOK);
|
|
ts = (struct timespec *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
nanotime(ts);
|
|
break;
|
|
|
|
case SCM_MONOTONIC:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*ts),
|
|
SCM_MONOTONIC, SOL_SOCKET, M_WAITOK);
|
|
ts = (struct timespec *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
nanouptime(ts);
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (space != NULL) {
|
|
*space += (*controlp)->m_len;
|
|
*mbcnt += MSIZE;
|
|
if ((*controlp)->m_flags & M_EXT)
|
|
*mbcnt += (*controlp)->m_ext.ext_size;
|
|
*clast = *controlp;
|
|
}
|
|
controlp = &(*controlp)->m_next;
|
|
}
|
|
if (clen > 0)
|
|
error = EINVAL;
|
|
|
|
out:
|
|
if (error != 0 && initial_controlp != NULL)
|
|
unp_internalize_cleanup_rights(*initial_controlp);
|
|
m_freem(control);
|
|
return (error);
|
|
}
|
|
|
|
static struct mbuf *
|
|
unp_addsockcred(struct thread *td, struct mbuf *control, int mode,
|
|
struct mbuf **clast, u_int *space, u_int *mbcnt)
|
|
{
|
|
struct mbuf *m, *n, *n_prev;
|
|
const struct cmsghdr *cm;
|
|
int ngroups, i, cmsgtype;
|
|
size_t ctrlsz;
|
|
|
|
ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
|
|
if (mode & UNP_WANTCRED_ALWAYS) {
|
|
ctrlsz = SOCKCRED2SIZE(ngroups);
|
|
cmsgtype = SCM_CREDS2;
|
|
} else {
|
|
ctrlsz = SOCKCREDSIZE(ngroups);
|
|
cmsgtype = SCM_CREDS;
|
|
}
|
|
|
|
m = sbcreatecontrol(NULL, ctrlsz, cmsgtype, SOL_SOCKET, M_NOWAIT);
|
|
if (m == NULL)
|
|
return (control);
|
|
MPASS((m->m_flags & M_EXT) == 0 && m->m_next == NULL);
|
|
|
|
if (mode & UNP_WANTCRED_ALWAYS) {
|
|
struct sockcred2 *sc;
|
|
|
|
sc = (void *)CMSG_DATA(mtod(m, struct cmsghdr *));
|
|
sc->sc_version = 0;
|
|
sc->sc_pid = td->td_proc->p_pid;
|
|
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];
|
|
} else {
|
|
struct sockcred *sc;
|
|
|
|
sc = (void *)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 && cmsgtype == SCM_CREDS)
|
|
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;
|
|
if (space != NULL) {
|
|
MPASS(*space >= n->m_len);
|
|
*space -= n->m_len;
|
|
MPASS(*mbcnt >= MSIZE);
|
|
*mbcnt -= MSIZE;
|
|
if (n->m_flags & M_EXT) {
|
|
MPASS(*mbcnt >=
|
|
n->m_ext.ext_size);
|
|
*mbcnt -= n->m_ext.ext_size;
|
|
}
|
|
MPASS(clast);
|
|
if (*clast == n) {
|
|
MPASS(n->m_next == NULL);
|
|
if (n_prev == NULL)
|
|
*clast = m;
|
|
else
|
|
*clast = n_prev;
|
|
}
|
|
}
|
|
n = m_free(n);
|
|
} else {
|
|
n_prev = n;
|
|
n = n->m_next;
|
|
}
|
|
}
|
|
|
|
/* Prepend it to the head. */
|
|
m->m_next = control;
|
|
if (space != NULL) {
|
|
*space += m->m_len;
|
|
*mbcnt += MSIZE;
|
|
if (control == NULL)
|
|
*clast = m;
|
|
}
|
|
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
|
|
closef_nothread(fp);
|
|
}
|
|
|
|
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_nothread(dr->ud_fp);
|
|
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++;
|
|
}
|
|
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 void
|
|
unp_remove_dead_ref(struct filedescent **fdep, int fdcount)
|
|
{
|
|
struct unpcb *unp;
|
|
struct file *fp;
|
|
int i;
|
|
|
|
/*
|
|
* This function can only be called from the gc task.
|
|
*/
|
|
KASSERT(taskqueue_member(taskqueue_thread, curthread) != 0,
|
|
("%s: not on gc callout", __func__));
|
|
UNP_LINK_LOCK_ASSERT();
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
fp = fdep[i]->fde_file;
|
|
if ((unp = fptounp(fp)) == NULL)
|
|
continue;
|
|
if ((unp->unp_gcflag & UNPGC_DEAD) == 0)
|
|
continue;
|
|
unp->unp_gcrefs--;
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_restore_undead_ref(struct filedescent **fdep, int fdcount)
|
|
{
|
|
struct unpcb *unp;
|
|
struct file *fp;
|
|
int i;
|
|
|
|
/*
|
|
* This function can only be called from the gc task.
|
|
*/
|
|
KASSERT(taskqueue_member(taskqueue_thread, curthread) != 0,
|
|
("%s: not on gc callout", __func__));
|
|
UNP_LINK_LOCK_ASSERT();
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
fp = fdep[i]->fde_file;
|
|
if ((unp = fptounp(fp)) == NULL)
|
|
continue;
|
|
if ((unp->unp_gcflag & UNPGC_DEAD) == 0)
|
|
continue;
|
|
unp->unp_gcrefs++;
|
|
unp_marked++;
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_scan_socket(struct socket *so, void (*op)(struct filedescent **, int))
|
|
{
|
|
struct sockbuf *sb;
|
|
|
|
SOCK_LOCK_ASSERT(so);
|
|
|
|
if (sotounpcb(so)->unp_gcflag & UNPGC_IGNORE_RIGHTS)
|
|
return;
|
|
|
|
SOCK_RECVBUF_LOCK(so);
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
unp_scan(STAILQ_FIRST(&so->so_rcv.uxdg_mb), op);
|
|
unp_scan(so->so_rcv.uxdg_peeked, op);
|
|
TAILQ_FOREACH(sb, &so->so_rcv.uxdg_conns, uxdg_clist)
|
|
unp_scan(STAILQ_FIRST(&sb->uxdg_mb), op);
|
|
break;
|
|
case SOCK_STREAM:
|
|
case SOCK_SEQPACKET:
|
|
unp_scan(so->so_rcv.sb_mb, op);
|
|
break;
|
|
}
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
}
|
|
|
|
static void
|
|
unp_gc_scan(struct unpcb *unp, void (*op)(struct filedescent **, int))
|
|
{
|
|
struct socket *so, *soa;
|
|
|
|
so = unp->unp_socket;
|
|
SOCK_LOCK(so);
|
|
if (SOLISTENING(so)) {
|
|
/*
|
|
* Mark all sockets in our accept queue.
|
|
*/
|
|
TAILQ_FOREACH(soa, &so->sol_comp, so_list)
|
|
unp_scan_socket(soa, op);
|
|
} else {
|
|
/*
|
|
* Mark all sockets we reference with RIGHTS.
|
|
*/
|
|
unp_scan_socket(so, op);
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
|
|
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.");
|
|
|
|
SYSCTL_UINT(_net_local, OID_AUTO, sockcount, CTLFLAG_RD, &unp_count, 0,
|
|
"Number of active local sockets.");
|
|
|
|
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 unp_head unp_deadhead; /* List of potentially-dead sockets. */
|
|
struct file *f, **unref;
|
|
struct unpcb *unp, *unptmp;
|
|
int i, total, unp_unreachable;
|
|
|
|
LIST_INIT(&unp_deadhead);
|
|
unp_taskcount++;
|
|
UNP_LINK_RLOCK();
|
|
/*
|
|
* First determine which sockets may be in cycles.
|
|
*/
|
|
unp_unreachable = 0;
|
|
|
|
for (head = heads; *head != NULL; head++)
|
|
LIST_FOREACH(unp, *head, unp_link) {
|
|
KASSERT((unp->unp_gcflag & ~UNPGC_IGNORE_RIGHTS) == 0,
|
|
("%s: unp %p has unexpected gc flags 0x%x",
|
|
__func__, unp, (unsigned int)unp->unp_gcflag));
|
|
|
|
f = unp->unp_file;
|
|
|
|
/*
|
|
* Check for an unreachable 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 (f != NULL && unp->unp_msgcount != 0 &&
|
|
refcount_load(&f->f_count) == unp->unp_msgcount) {
|
|
LIST_INSERT_HEAD(&unp_deadhead, unp, unp_dead);
|
|
unp->unp_gcflag |= UNPGC_DEAD;
|
|
unp->unp_gcrefs = unp->unp_msgcount;
|
|
unp_unreachable++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Scan all sockets previously marked as potentially being in a cycle
|
|
* and remove the references each socket holds on any UNPGC_DEAD
|
|
* sockets in its queue. After this step, all remaining references on
|
|
* sockets marked UNPGC_DEAD should not be part of any cycle.
|
|
*/
|
|
LIST_FOREACH(unp, &unp_deadhead, unp_dead)
|
|
unp_gc_scan(unp, unp_remove_dead_ref);
|
|
|
|
/*
|
|
* If a socket still has a non-negative refcount, it cannot be in a
|
|
* cycle. In this case increment refcount of all children iteratively.
|
|
* Stop the scan once we do a complete loop without discovering
|
|
* a new reachable socket.
|
|
*/
|
|
do {
|
|
unp_marked = 0;
|
|
LIST_FOREACH_SAFE(unp, &unp_deadhead, unp_dead, unptmp)
|
|
if (unp->unp_gcrefs > 0) {
|
|
unp->unp_gcflag &= ~UNPGC_DEAD;
|
|
LIST_REMOVE(unp, unp_dead);
|
|
KASSERT(unp_unreachable > 0,
|
|
("%s: unp_unreachable underflow.",
|
|
__func__));
|
|
unp_unreachable--;
|
|
unp_gc_scan(unp, unp_restore_undead_ref);
|
|
}
|
|
} while (unp_marked);
|
|
|
|
UNP_LINK_RUNLOCK();
|
|
|
|
if (unp_unreachable == 0)
|
|
return;
|
|
|
|
/*
|
|
* Allocate space for a local array of dead unpcbs.
|
|
* TODO: can this path be simplified by instead using the local
|
|
* dead list at unp_deadhead, after taking out references
|
|
* on the file object and/or unpcb and dropping the link lock?
|
|
*/
|
|
unref = malloc(unp_unreachable * sizeof(struct file *),
|
|
M_TEMP, M_WAITOK);
|
|
|
|
/*
|
|
* Iterate looking for sockets which have been specifically marked
|
|
* as unreachable and store them locally.
|
|
*/
|
|
UNP_LINK_RLOCK();
|
|
total = 0;
|
|
LIST_FOREACH(unp, &unp_deadhead, unp_dead) {
|
|
KASSERT((unp->unp_gcflag & UNPGC_DEAD) != 0,
|
|
("%s: unp %p not marked UNPGC_DEAD", __func__, unp));
|
|
unp->unp_gcflag &= ~UNPGC_DEAD;
|
|
f = unp->unp_file;
|
|
if (unp->unp_msgcount == 0 || f == NULL ||
|
|
refcount_load(&f->f_count) != unp->unp_msgcount ||
|
|
!fhold(f))
|
|
continue;
|
|
unref[total++] = f;
|
|
KASSERT(total <= unp_unreachable,
|
|
("%s: incorrect unreachable count.", __func__));
|
|
}
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Synchronize against unp_gc, which can trip over data as we are freeing it.
|
|
*/
|
|
static void
|
|
unp_dispose(struct socket *so)
|
|
{
|
|
struct sockbuf *sb;
|
|
struct unpcb *unp;
|
|
struct mbuf *m;
|
|
|
|
MPASS(!SOLISTENING(so));
|
|
|
|
unp = sotounpcb(so);
|
|
UNP_LINK_WLOCK();
|
|
unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS;
|
|
UNP_LINK_WUNLOCK();
|
|
|
|
/*
|
|
* Grab our special mbufs before calling sbrelease().
|
|
*/
|
|
SOCK_RECVBUF_LOCK(so);
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
while ((sb = TAILQ_FIRST(&so->so_rcv.uxdg_conns)) != NULL) {
|
|
STAILQ_CONCAT(&so->so_rcv.uxdg_mb, &sb->uxdg_mb);
|
|
TAILQ_REMOVE(&so->so_rcv.uxdg_conns, sb, uxdg_clist);
|
|
/* Note: socket of sb may reconnect. */
|
|
sb->uxdg_cc = sb->uxdg_ctl = sb->uxdg_mbcnt = 0;
|
|
}
|
|
sb = &so->so_rcv;
|
|
if (sb->uxdg_peeked != NULL) {
|
|
STAILQ_INSERT_HEAD(&sb->uxdg_mb, sb->uxdg_peeked,
|
|
m_stailqpkt);
|
|
sb->uxdg_peeked = NULL;
|
|
}
|
|
m = STAILQ_FIRST(&sb->uxdg_mb);
|
|
STAILQ_INIT(&sb->uxdg_mb);
|
|
/* XXX: our shortened sbrelease() */
|
|
(void)chgsbsize(so->so_cred->cr_uidinfo, &sb->sb_hiwat, 0,
|
|
RLIM_INFINITY);
|
|
/*
|
|
* XXXGL Mark sb with SBS_CANTRCVMORE. This is needed to
|
|
* prevent uipc_sosend_dgram() or unp_disconnect() adding more
|
|
* data to the socket.
|
|
* We are now in dom_dispose and it could be a call from
|
|
* soshutdown() or from the final sofree(). The sofree() case
|
|
* is simple as it guarantees that no more sends will happen,
|
|
* however we can race with unp_disconnect() from our peer.
|
|
* The shutdown(2) case is more exotic. It would call into
|
|
* dom_dispose() only if socket is SS_ISCONNECTED. This is
|
|
* possible if we did connect(2) on this socket and we also
|
|
* had it bound with bind(2) and receive connections from other
|
|
* sockets. Because soshutdown() violates POSIX (see comment
|
|
* there) we will end up here shutting down our receive side.
|
|
* Of course this will have affect not only on the peer we
|
|
* connect(2)ed to, but also on all of the peers who had
|
|
* connect(2)ed to us. Their sends would end up with ENOBUFS.
|
|
*/
|
|
sb->sb_state |= SBS_CANTRCVMORE;
|
|
break;
|
|
case SOCK_STREAM:
|
|
case SOCK_SEQPACKET:
|
|
sb = &so->so_rcv;
|
|
m = sbcut_locked(sb, sb->sb_ccc);
|
|
KASSERT(sb->sb_ccc == 0 && sb->sb_mb == 0 && sb->sb_mbcnt == 0,
|
|
("%s: ccc %u mb %p mbcnt %u", __func__,
|
|
sb->sb_ccc, (void *)sb->sb_mb, sb->sb_mbcnt));
|
|
sbrelease_locked(so, SO_RCV);
|
|
break;
|
|
}
|
|
SOCK_RECVBUF_UNLOCK(so);
|
|
if (SOCK_IO_RECV_OWNED(so))
|
|
SOCK_IO_RECV_UNLOCK(so);
|
|
|
|
if (m != NULL) {
|
|
unp_scan(m, unp_freerights);
|
|
m_freem(m);
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
|
|
{
|
|
struct mbuf *m;
|
|
struct cmsghdr *cm;
|
|
void *data;
|
|
socklen_t clen, datalen;
|
|
|
|
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) {
|
|
(*op)(data, datalen /
|
|
sizeof(struct filedescent *));
|
|
}
|
|
|
|
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_nextpkt;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Definitions of protocols supported in the LOCAL domain.
|
|
*/
|
|
static struct protosw streamproto = {
|
|
.pr_type = SOCK_STREAM,
|
|
.pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS|
|
|
PR_CAPATTACH,
|
|
.pr_ctloutput = &uipc_ctloutput,
|
|
.pr_abort = uipc_abort,
|
|
.pr_accept = uipc_accept,
|
|
.pr_attach = uipc_attach,
|
|
.pr_bind = uipc_bind,
|
|
.pr_bindat = uipc_bindat,
|
|
.pr_connect = uipc_connect,
|
|
.pr_connectat = uipc_connectat,
|
|
.pr_connect2 = uipc_connect2,
|
|
.pr_detach = uipc_detach,
|
|
.pr_disconnect = uipc_disconnect,
|
|
.pr_listen = uipc_listen,
|
|
.pr_peeraddr = uipc_peeraddr,
|
|
.pr_rcvd = uipc_rcvd,
|
|
.pr_send = uipc_send,
|
|
.pr_ready = uipc_ready,
|
|
.pr_sense = uipc_sense,
|
|
.pr_shutdown = uipc_shutdown,
|
|
.pr_sockaddr = uipc_sockaddr,
|
|
.pr_soreceive = soreceive_generic,
|
|
.pr_close = uipc_close,
|
|
};
|
|
|
|
static struct protosw dgramproto = {
|
|
.pr_type = SOCK_DGRAM,
|
|
.pr_flags = PR_ATOMIC | PR_ADDR |PR_RIGHTS | PR_CAPATTACH |
|
|
PR_SOCKBUF,
|
|
.pr_ctloutput = &uipc_ctloutput,
|
|
.pr_abort = uipc_abort,
|
|
.pr_accept = uipc_accept,
|
|
.pr_attach = uipc_attach,
|
|
.pr_bind = uipc_bind,
|
|
.pr_bindat = uipc_bindat,
|
|
.pr_connect = uipc_connect,
|
|
.pr_connectat = uipc_connectat,
|
|
.pr_connect2 = uipc_connect2,
|
|
.pr_detach = uipc_detach,
|
|
.pr_disconnect = uipc_disconnect,
|
|
.pr_peeraddr = uipc_peeraddr,
|
|
.pr_sosend = uipc_sosend_dgram,
|
|
.pr_sense = uipc_sense,
|
|
.pr_shutdown = uipc_shutdown,
|
|
.pr_sockaddr = uipc_sockaddr,
|
|
.pr_soreceive = uipc_soreceive_dgram,
|
|
.pr_close = uipc_close,
|
|
};
|
|
|
|
static struct protosw seqpacketproto = {
|
|
.pr_type = SOCK_SEQPACKET,
|
|
/*
|
|
* XXXRW: For now, PR_ADDR because soreceive will bump into them
|
|
* due to our use of sbappendaddr. A new sbappend variants is needed
|
|
* that supports both atomic record writes and control data.
|
|
*/
|
|
.pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|
|
|
PR_WANTRCVD|PR_RIGHTS|PR_CAPATTACH,
|
|
.pr_ctloutput = &uipc_ctloutput,
|
|
.pr_abort = uipc_abort,
|
|
.pr_accept = uipc_accept,
|
|
.pr_attach = uipc_attach,
|
|
.pr_bind = uipc_bind,
|
|
.pr_bindat = uipc_bindat,
|
|
.pr_connect = uipc_connect,
|
|
.pr_connectat = uipc_connectat,
|
|
.pr_connect2 = uipc_connect2,
|
|
.pr_detach = uipc_detach,
|
|
.pr_disconnect = uipc_disconnect,
|
|
.pr_listen = uipc_listen,
|
|
.pr_peeraddr = uipc_peeraddr,
|
|
.pr_rcvd = uipc_rcvd,
|
|
.pr_send = uipc_send,
|
|
.pr_sense = uipc_sense,
|
|
.pr_shutdown = uipc_shutdown,
|
|
.pr_sockaddr = uipc_sockaddr,
|
|
.pr_soreceive = soreceive_generic, /* XXX: or...? */
|
|
.pr_close = uipc_close,
|
|
};
|
|
|
|
static struct domain localdomain = {
|
|
.dom_family = AF_LOCAL,
|
|
.dom_name = "local",
|
|
.dom_externalize = unp_externalize,
|
|
.dom_dispose = unp_dispose,
|
|
.dom_nprotosw = 3,
|
|
.dom_protosw = {
|
|
&streamproto,
|
|
&dgramproto,
|
|
&seqpacketproto,
|
|
}
|
|
};
|
|
DOMAIN_SET(local);
|
|
|
|
/*
|
|
* 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 unpcb *unp;
|
|
int active;
|
|
struct mtx *vplock;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
|
|
KASSERT(vp->v_type == VSOCK,
|
|
("vfs_unp_reclaim: vp->v_type != VSOCK"));
|
|
|
|
active = 0;
|
|
vplock = mtx_pool_find(mtxpool_sleep, vp);
|
|
mtx_lock(vplock);
|
|
VOP_UNP_CONNECT(vp, &unp);
|
|
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:
|
|
mtx_unlock(vplock);
|
|
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_WANTCRED_ALWAYS) {
|
|
db_printf("%sUNP_WANTCRED_ALWAYS", comma ? ", " : "");
|
|
comma = 1;
|
|
}
|
|
if (unp_flags & UNP_WANTCRED_ONESHOT) {
|
|
db_printf("%sUNP_WANTCRED_ONESHOT", 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_pid: %d cr_ngroups: %d\n",
|
|
xu->cr_version, xu->cr_uid, xu->cr_pid, 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: %ju unp_conn: %p\n", (uintmax_t)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_gencnt: %llu\n",
|
|
(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);
|
|
|
|
db_printf("unp_refcount: %u\n", unp->unp_refcount);
|
|
}
|
|
#endif
|