mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
e4643c730a
as this is more correct and matches the sysctl variable.
1819 lines
42 KiB
C
1819 lines
42 KiB
C
/*
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* Copyright 2004 Robert N. M. Watson
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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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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/domain.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h> /* XXX must be before <sys/file.h> */
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/mbuf.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/resourcevar.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/un.h>
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#include <sys/unpcb.h>
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#include <sys/vnode.h>
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#include <vm/uma.h>
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static uma_zone_t unp_zone;
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static unp_gen_t unp_gencnt;
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static u_int unp_count;
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static struct unp_head unp_shead, unp_dhead;
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/*
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* Unix communications domain.
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*
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* TODO:
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* SEQPACKET, RDM
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* rethink name space problems
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* need a proper out-of-band
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* lock pushdown
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*/
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static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
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static ino_t unp_ino; /* prototype for fake inode numbers */
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/*
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* Currently, UNIX domain sockets are protected by a single subsystem lock,
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* which covers global data structures and variables, the contents of each
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* per-socket unpcb structure, and the so_pcb field in sockets attached to
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* the UNIX domain. This provides for a moderate degree of paralellism, as
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* receive operations on UNIX domain sockets do not need to acquire the
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* subsystem lock. Finer grained locking to permit send() without acquiring
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* a global lock would be a logical next step.
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*
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* The UNIX domain socket lock preceds all socket layer locks, including the
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* socket lock and socket buffer lock, permitting UNIX domain socket code to
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* call into socket support routines without releasing its locks.
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*
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* Some caution is required in areas where the UNIX domain socket code enters
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* VFS in order to create or find rendezvous points. This results in
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* dropping of the UNIX domain socket subsystem lock, acquisition of the
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* Giant lock, and potential sleeping. This increases the chances of races,
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* and exposes weaknesses in the socket->protocol API by offering poor
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* failure modes.
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*/
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static struct mtx unp_mtx;
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#define UNP_LOCK_INIT() \
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mtx_init(&unp_mtx, "unp", NULL, MTX_DEF)
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#define UNP_LOCK() mtx_lock(&unp_mtx)
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#define UNP_UNLOCK() mtx_unlock(&unp_mtx)
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#define UNP_LOCK_ASSERT() mtx_assert(&unp_mtx, MA_OWNED)
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#define UNP_UNLOCK_ASSERT() mtx_assert(&unp_mtx, MA_NOTOWNED)
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static int unp_attach(struct socket *);
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static void unp_detach(struct unpcb *);
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static int unp_bind(struct unpcb *,struct sockaddr *, struct thread *);
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static int unp_connect(struct socket *,struct sockaddr *, struct thread *);
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static int unp_connect2(struct socket *so, struct socket *so2);
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static void unp_disconnect(struct unpcb *);
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static void unp_shutdown(struct unpcb *);
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static void unp_drop(struct unpcb *, int);
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static void unp_gc(void);
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static void unp_scan(struct mbuf *, void (*)(struct file *));
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static void unp_mark(struct file *);
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static void unp_discard(struct file *);
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static void unp_freerights(struct file **, int);
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static int unp_internalize(struct mbuf **, struct thread *);
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static int unp_listen(struct unpcb *, struct thread *);
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static int
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uipc_abort(struct socket *so)
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{
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struct unpcb *unp;
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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unp_drop(unp, ECONNABORTED);
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unp_detach(unp);
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UNP_UNLOCK_ASSERT();
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ACCEPT_LOCK();
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SOCK_LOCK(so);
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sotryfree(so);
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return (0);
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}
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static int
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uipc_accept(struct socket *so, struct sockaddr **nam)
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{
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struct unpcb *unp;
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const struct sockaddr *sa;
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/*
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* Pass back name of connected socket,
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* if it was bound and we are still connected
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* (our peer may have closed already!).
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*/
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*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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free(*nam, M_SONAME);
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*nam = NULL;
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return (EINVAL);
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}
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if (unp->unp_conn != NULL && unp->unp_conn->unp_addr != NULL)
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sa = (struct sockaddr *) unp->unp_conn->unp_addr;
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else
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sa = &sun_noname;
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bcopy(sa, *nam, sa->sa_len);
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UNP_UNLOCK();
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return (0);
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}
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static int
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uipc_attach(struct socket *so, int proto, struct thread *td)
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{
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struct unpcb *unp = sotounpcb(so);
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if (unp != NULL)
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return (EISCONN);
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return (unp_attach(so));
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}
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static int
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uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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struct unpcb *unp;
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int error;
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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error = unp_bind(unp, nam, td);
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UNP_UNLOCK();
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return (error);
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}
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static int
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uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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struct unpcb *unp;
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int error;
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KASSERT(td == curthread, ("uipc_connect: td != curthread"));
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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error = unp_connect(so, nam, td);
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UNP_UNLOCK();
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return (error);
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}
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int
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uipc_connect2(struct socket *so1, struct socket *so2)
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{
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struct unpcb *unp;
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int error;
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UNP_LOCK();
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unp = sotounpcb(so1);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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error = unp_connect2(so1, so2);
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UNP_UNLOCK();
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return (error);
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}
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/* control is EOPNOTSUPP */
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static int
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uipc_detach(struct socket *so)
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{
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struct unpcb *unp;
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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unp_detach(unp);
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UNP_UNLOCK_ASSERT();
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return (0);
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}
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static int
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uipc_disconnect(struct socket *so)
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{
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struct unpcb *unp;
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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unp_disconnect(unp);
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UNP_UNLOCK();
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return (0);
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}
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static int
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uipc_listen(struct socket *so, struct thread *td)
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{
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struct unpcb *unp;
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int error;
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL || unp->unp_vnode == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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error = unp_listen(unp, td);
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UNP_UNLOCK();
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return (error);
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}
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static int
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uipc_peeraddr(struct socket *so, struct sockaddr **nam)
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{
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struct unpcb *unp;
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const struct sockaddr *sa;
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*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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free(*nam, M_SONAME);
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*nam = NULL;
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return (EINVAL);
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}
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if (unp->unp_conn != NULL && unp->unp_conn->unp_addr!= NULL)
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sa = (struct sockaddr *) unp->unp_conn->unp_addr;
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else {
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/*
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* XXX: It seems that this test always fails even when
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* connection is established. So, this else clause is
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* added as workaround to return PF_LOCAL sockaddr.
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*/
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sa = &sun_noname;
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}
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bcopy(sa, *nam, sa->sa_len);
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UNP_UNLOCK();
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return (0);
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}
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static int
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uipc_rcvd(struct socket *so, int flags)
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{
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struct unpcb *unp;
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struct socket *so2;
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u_long newhiwat;
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UNP_LOCK();
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unp = sotounpcb(so);
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if (unp == NULL) {
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UNP_UNLOCK();
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return (EINVAL);
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}
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switch (so->so_type) {
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case SOCK_DGRAM:
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panic("uipc_rcvd DGRAM?");
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/*NOTREACHED*/
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case SOCK_STREAM:
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if (unp->unp_conn == NULL)
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break;
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so2 = unp->unp_conn->unp_socket;
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SOCKBUF_LOCK(&so2->so_snd);
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SOCKBUF_LOCK(&so->so_rcv);
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/*
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* Adjust backpressure on sender
|
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* and wakeup any waiting to write.
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*/
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so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
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unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
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newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
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so->so_rcv.sb_cc;
|
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(void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
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newhiwat, RLIM_INFINITY);
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unp->unp_cc = so->so_rcv.sb_cc;
|
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SOCKBUF_UNLOCK(&so->so_rcv);
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sowwakeup_locked(so2);
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break;
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default:
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panic("uipc_rcvd unknown socktype");
|
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}
|
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UNP_UNLOCK();
|
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return (0);
|
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}
|
|
|
|
/* pru_rcvoob is EOPNOTSUPP */
|
|
|
|
static int
|
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uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
int error = 0;
|
|
struct unpcb *unp;
|
|
struct socket *so2;
|
|
u_long newhiwat;
|
|
|
|
unp = sotounpcb(so);
|
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if (unp == NULL) {
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
if (flags & PRUS_OOB) {
|
|
error = EOPNOTSUPP;
|
|
goto release;
|
|
}
|
|
|
|
if (control != NULL && (error = unp_internalize(&control, td)))
|
|
goto release;
|
|
|
|
UNP_LOCK();
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL) {
|
|
UNP_UNLOCK();
|
|
error = EINVAL;
|
|
goto dispose_release;
|
|
}
|
|
|
|
switch (so->so_type) {
|
|
case SOCK_DGRAM:
|
|
{
|
|
const struct sockaddr *from;
|
|
|
|
if (nam != NULL) {
|
|
if (unp->unp_conn != NULL) {
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
error = unp_connect(so, nam, td);
|
|
if (error)
|
|
break;
|
|
} else {
|
|
if (unp->unp_conn == NULL) {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
}
|
|
so2 = unp->unp_conn->unp_socket;
|
|
if (unp->unp_addr != NULL)
|
|
from = (struct sockaddr *)unp->unp_addr;
|
|
else
|
|
from = &sun_noname;
|
|
SOCKBUF_LOCK(&so2->so_rcv);
|
|
if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
|
|
sorwakeup_locked(so2);
|
|
m = NULL;
|
|
control = NULL;
|
|
} else {
|
|
SOCKBUF_UNLOCK(&so2->so_rcv);
|
|
error = ENOBUFS;
|
|
}
|
|
if (nam != NULL)
|
|
unp_disconnect(unp);
|
|
break;
|
|
}
|
|
|
|
case SOCK_STREAM:
|
|
/* Connect if not connected yet. */
|
|
/*
|
|
* Note: A better implementation would complain
|
|
* if not equal to the peer's address.
|
|
*/
|
|
if ((so->so_state & SS_ISCONNECTED) == 0) {
|
|
if (nam != NULL) {
|
|
error = unp_connect(so, nam, td);
|
|
if (error)
|
|
break; /* XXX */
|
|
} else {
|
|
error = ENOTCONN;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
|
|
error = EPIPE;
|
|
break;
|
|
}
|
|
if (unp->unp_conn == NULL)
|
|
panic("uipc_send connected but no connection?");
|
|
so2 = unp->unp_conn->unp_socket;
|
|
SOCKBUF_LOCK(&so2->so_rcv);
|
|
/*
|
|
* Send to paired receive port, and then reduce
|
|
* send buffer hiwater marks to maintain backpressure.
|
|
* Wake up readers.
|
|
*/
|
|
if (control != NULL) {
|
|
if (sbappendcontrol_locked(&so2->so_rcv, m, control))
|
|
control = NULL;
|
|
} else {
|
|
sbappend_locked(&so2->so_rcv, m);
|
|
}
|
|
so->so_snd.sb_mbmax -=
|
|
so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
|
|
unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
|
|
newhiwat = so->so_snd.sb_hiwat -
|
|
(so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
|
|
(void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
|
|
newhiwat, RLIM_INFINITY);
|
|
unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
|
|
sorwakeup_locked(so2);
|
|
m = NULL;
|
|
break;
|
|
|
|
default:
|
|
panic("uipc_send unknown socktype");
|
|
}
|
|
|
|
/*
|
|
* SEND_EOF is equivalent to a SEND followed by
|
|
* a SHUTDOWN.
|
|
*/
|
|
if (flags & PRUS_EOF) {
|
|
socantsendmore(so);
|
|
unp_shutdown(unp);
|
|
}
|
|
UNP_UNLOCK();
|
|
|
|
dispose_release:
|
|
if (control != NULL && error != 0)
|
|
unp_dispose(control);
|
|
|
|
release:
|
|
if (control != NULL)
|
|
m_freem(control);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
uipc_sense(struct socket *so, struct stat *sb)
|
|
{
|
|
struct unpcb *unp;
|
|
struct socket *so2;
|
|
|
|
UNP_LOCK();
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL) {
|
|
UNP_UNLOCK();
|
|
return (EINVAL);
|
|
}
|
|
sb->st_blksize = so->so_snd.sb_hiwat;
|
|
if (so->so_type == SOCK_STREAM && unp->unp_conn != NULL) {
|
|
so2 = unp->unp_conn->unp_socket;
|
|
sb->st_blksize += so2->so_rcv.sb_cc;
|
|
}
|
|
sb->st_dev = NODEV;
|
|
if (unp->unp_ino == 0)
|
|
unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
|
|
sb->st_ino = unp->unp_ino;
|
|
UNP_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_shutdown(struct socket *so)
|
|
{
|
|
struct unpcb *unp;
|
|
|
|
UNP_LOCK();
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL) {
|
|
UNP_UNLOCK();
|
|
return (EINVAL);
|
|
}
|
|
socantsendmore(so);
|
|
unp_shutdown(unp);
|
|
UNP_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
uipc_sockaddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
struct unpcb *unp;
|
|
const struct sockaddr *sa;
|
|
|
|
*nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
UNP_LOCK();
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL) {
|
|
UNP_UNLOCK();
|
|
free(*nam, M_SONAME);
|
|
*nam = NULL;
|
|
return (EINVAL);
|
|
}
|
|
if (unp->unp_addr != NULL)
|
|
sa = (struct sockaddr *) unp->unp_addr;
|
|
else
|
|
sa = &sun_noname;
|
|
bcopy(sa, *nam, sa->sa_len);
|
|
UNP_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
struct pr_usrreqs uipc_usrreqs = {
|
|
.pru_abort = uipc_abort,
|
|
.pru_accept = uipc_accept,
|
|
.pru_attach = uipc_attach,
|
|
.pru_bind = uipc_bind,
|
|
.pru_connect = uipc_connect,
|
|
.pru_connect2 = uipc_connect2,
|
|
.pru_detach = uipc_detach,
|
|
.pru_disconnect = uipc_disconnect,
|
|
.pru_listen = uipc_listen,
|
|
.pru_peeraddr = uipc_peeraddr,
|
|
.pru_rcvd = uipc_rcvd,
|
|
.pru_send = uipc_send,
|
|
.pru_sense = uipc_sense,
|
|
.pru_shutdown = uipc_shutdown,
|
|
.pru_sockaddr = uipc_sockaddr,
|
|
.pru_sosend = sosend,
|
|
.pru_soreceive = soreceive,
|
|
.pru_sopoll = sopoll,
|
|
};
|
|
|
|
int
|
|
uipc_ctloutput(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
struct unpcb *unp;
|
|
struct xucred xu;
|
|
int error;
|
|
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case LOCAL_PEERCRED:
|
|
error = 0;
|
|
UNP_LOCK();
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL) {
|
|
UNP_UNLOCK();
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (unp->unp_flags & UNP_HAVEPC)
|
|
xu = unp->unp_peercred;
|
|
else {
|
|
if (so->so_type == SOCK_STREAM)
|
|
error = ENOTCONN;
|
|
else
|
|
error = EINVAL;
|
|
}
|
|
UNP_UNLOCK();
|
|
if (error == 0)
|
|
error = sooptcopyout(sopt, &xu, sizeof(xu));
|
|
break;
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
break;
|
|
case SOPT_SET:
|
|
default:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Both send and receive buffers are allocated PIPSIZ bytes of buffering
|
|
* for stream sockets, although the total for sender and receiver is
|
|
* actually only PIPSIZ.
|
|
* Datagram sockets really use the sendspace as the maximum datagram size,
|
|
* and don't really want to reserve the sendspace. Their recvspace should
|
|
* be large enough for at least one max-size datagram plus address.
|
|
*/
|
|
#ifndef PIPSIZ
|
|
#define PIPSIZ 8192
|
|
#endif
|
|
static u_long unpst_sendspace = PIPSIZ;
|
|
static u_long unpst_recvspace = PIPSIZ;
|
|
static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
|
|
static u_long unpdg_recvspace = 4*1024;
|
|
|
|
static int unp_rights; /* file descriptors in flight */
|
|
|
|
SYSCTL_DECL(_net_local_stream);
|
|
SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
|
|
&unpst_sendspace, 0, "");
|
|
SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
|
|
&unpst_recvspace, 0, "");
|
|
SYSCTL_DECL(_net_local_dgram);
|
|
SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
|
|
&unpdg_sendspace, 0, "");
|
|
SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
|
|
&unpdg_recvspace, 0, "");
|
|
SYSCTL_DECL(_net_local);
|
|
SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
|
|
|
|
static int
|
|
unp_attach(so)
|
|
struct socket *so;
|
|
{
|
|
register struct unpcb *unp;
|
|
int error;
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
switch (so->so_type) {
|
|
|
|
case SOCK_STREAM:
|
|
error = soreserve(so, unpst_sendspace, unpst_recvspace);
|
|
break;
|
|
|
|
case SOCK_DGRAM:
|
|
error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
|
|
break;
|
|
|
|
default:
|
|
panic("unp_attach");
|
|
}
|
|
if (error)
|
|
return (error);
|
|
}
|
|
unp = uma_zalloc(unp_zone, M_WAITOK);
|
|
if (unp == NULL)
|
|
return (ENOBUFS);
|
|
bzero(unp, sizeof *unp);
|
|
LIST_INIT(&unp->unp_refs);
|
|
unp->unp_socket = so;
|
|
|
|
UNP_LOCK();
|
|
unp->unp_gencnt = ++unp_gencnt;
|
|
unp_count++;
|
|
LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
|
|
: &unp_shead, unp, unp_link);
|
|
so->so_pcb = unp;
|
|
UNP_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
unp_detach(unp)
|
|
register struct unpcb *unp;
|
|
{
|
|
struct vnode *vp;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
LIST_REMOVE(unp, unp_link);
|
|
unp->unp_gencnt = ++unp_gencnt;
|
|
--unp_count;
|
|
if ((vp = unp->unp_vnode) != NULL) {
|
|
/*
|
|
* XXXRW: should v_socket be frobbed only while holding
|
|
* Giant?
|
|
*/
|
|
unp->unp_vnode->v_socket = NULL;
|
|
unp->unp_vnode = NULL;
|
|
}
|
|
if (unp->unp_conn != NULL)
|
|
unp_disconnect(unp);
|
|
while (!LIST_EMPTY(&unp->unp_refs)) {
|
|
struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
|
|
unp_drop(ref, ECONNRESET);
|
|
}
|
|
soisdisconnected(unp->unp_socket);
|
|
unp->unp_socket->so_pcb = NULL;
|
|
if (unp_rights) {
|
|
/*
|
|
* Normally the receive buffer is flushed later,
|
|
* in sofree, but if our receive buffer holds references
|
|
* to descriptors that are now garbage, we will dispose
|
|
* of those descriptor references after the garbage collector
|
|
* gets them (resulting in a "panic: closef: count < 0").
|
|
*/
|
|
sorflush(unp->unp_socket);
|
|
unp_gc(); /* Will unlock UNP. */
|
|
} else
|
|
UNP_UNLOCK();
|
|
UNP_UNLOCK_ASSERT();
|
|
if (unp->unp_addr != NULL)
|
|
FREE(unp->unp_addr, M_SONAME);
|
|
uma_zfree(unp_zone, unp);
|
|
if (vp) {
|
|
mtx_lock(&Giant);
|
|
vrele(vp);
|
|
mtx_unlock(&Giant);
|
|
}
|
|
}
|
|
|
|
static int
|
|
unp_bind(unp, nam, td)
|
|
struct unpcb *unp;
|
|
struct sockaddr *nam;
|
|
struct thread *td;
|
|
{
|
|
struct sockaddr_un *soun = (struct sockaddr_un *)nam;
|
|
struct vnode *vp;
|
|
struct mount *mp;
|
|
struct vattr vattr;
|
|
int error, namelen;
|
|
struct nameidata nd;
|
|
char *buf;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
/*
|
|
* XXXRW: This test-and-set of unp_vnode is non-atomic; the
|
|
* unlocked read here is fine, but the value of unp_vnode needs
|
|
* to be tested again after we do all the lookups to see if the
|
|
* pcb is still unbound?
|
|
*/
|
|
if (unp->unp_vnode != NULL)
|
|
return (EINVAL);
|
|
|
|
namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
|
|
if (namelen <= 0)
|
|
return (EINVAL);
|
|
|
|
UNP_UNLOCK();
|
|
|
|
buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
|
|
strlcpy(buf, soun->sun_path, namelen + 1);
|
|
|
|
mtx_lock(&Giant);
|
|
restart:
|
|
mtx_assert(&Giant, MA_OWNED);
|
|
NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE,
|
|
buf, td);
|
|
/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
|
|
error = namei(&nd);
|
|
if (error)
|
|
goto done;
|
|
vp = nd.ni_vp;
|
|
if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
if (nd.ni_dvp == vp)
|
|
vrele(nd.ni_dvp);
|
|
else
|
|
vput(nd.ni_dvp);
|
|
if (vp != NULL) {
|
|
vrele(vp);
|
|
error = EADDRINUSE;
|
|
goto done;
|
|
}
|
|
error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
|
|
if (error)
|
|
goto done;
|
|
goto restart;
|
|
}
|
|
VATTR_NULL(&vattr);
|
|
vattr.va_type = VSOCK;
|
|
vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
|
|
#ifdef MAC
|
|
error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
|
|
&vattr);
|
|
#endif
|
|
if (error == 0) {
|
|
VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
|
|
error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
|
|
}
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
vput(nd.ni_dvp);
|
|
if (error)
|
|
goto done;
|
|
vp = nd.ni_vp;
|
|
ASSERT_VOP_LOCKED(vp, "unp_bind");
|
|
soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
|
|
UNP_LOCK();
|
|
vp->v_socket = unp->unp_socket;
|
|
unp->unp_vnode = vp;
|
|
unp->unp_addr = soun;
|
|
UNP_UNLOCK();
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vn_finished_write(mp);
|
|
done:
|
|
mtx_unlock(&Giant);
|
|
free(buf, M_TEMP);
|
|
UNP_LOCK();
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unp_connect(so, nam, td)
|
|
struct socket *so;
|
|
struct sockaddr *nam;
|
|
struct thread *td;
|
|
{
|
|
register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
|
|
register struct vnode *vp;
|
|
register struct socket *so2, *so3;
|
|
struct unpcb *unp, *unp2, *unp3;
|
|
int error, len;
|
|
struct nameidata nd;
|
|
char buf[SOCK_MAXADDRLEN];
|
|
struct sockaddr *sa;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
unp = sotounpcb(so);
|
|
|
|
len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
|
|
if (len <= 0)
|
|
return (EINVAL);
|
|
strlcpy(buf, soun->sun_path, len + 1);
|
|
UNP_UNLOCK();
|
|
sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
|
|
mtx_lock(&Giant);
|
|
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td);
|
|
error = namei(&nd);
|
|
if (error)
|
|
vp = NULL;
|
|
else
|
|
vp = nd.ni_vp;
|
|
ASSERT_VOP_LOCKED(vp, "unp_connect");
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
if (error)
|
|
goto bad;
|
|
|
|
if (vp->v_type != VSOCK) {
|
|
error = ENOTSOCK;
|
|
goto bad;
|
|
}
|
|
error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
|
|
if (error)
|
|
goto bad;
|
|
mtx_unlock(&Giant);
|
|
UNP_LOCK();
|
|
unp = sotounpcb(so);
|
|
if (unp == NULL) {
|
|
/*
|
|
* XXXRW: Temporary debugging printf.
|
|
*/
|
|
printf("unp_connect(): lost race to another thread\n");
|
|
error = EINVAL;
|
|
goto bad2;
|
|
}
|
|
so2 = vp->v_socket;
|
|
if (so2 == NULL) {
|
|
error = ECONNREFUSED;
|
|
goto bad2;
|
|
}
|
|
if (so->so_type != so2->so_type) {
|
|
error = EPROTOTYPE;
|
|
goto bad2;
|
|
}
|
|
if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
|
|
if (so2->so_options & SO_ACCEPTCONN) {
|
|
/*
|
|
* NB: drop locks here so unp_attach is entered
|
|
* w/o locks; this avoids a recursive lock
|
|
* of the head and holding sleep locks across
|
|
* a (potentially) blocking malloc.
|
|
*/
|
|
UNP_UNLOCK();
|
|
so3 = sonewconn(so2, 0);
|
|
UNP_LOCK();
|
|
} else
|
|
so3 = NULL;
|
|
if (so3 == NULL) {
|
|
error = ECONNREFUSED;
|
|
goto bad2;
|
|
}
|
|
unp = sotounpcb(so);
|
|
unp2 = sotounpcb(so2);
|
|
unp3 = sotounpcb(so3);
|
|
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_peercred management:
|
|
*
|
|
* The connecter's (client's) credentials are copied
|
|
* from its process structure at the time of connect()
|
|
* (which is now).
|
|
*/
|
|
cru2x(td->td_ucred, &unp3->unp_peercred);
|
|
unp3->unp_flags |= UNP_HAVEPC;
|
|
/*
|
|
* The receiver's (server's) credentials are copied
|
|
* from the unp_peercred member of socket on which the
|
|
* former called listen(); unp_listen() cached that
|
|
* process's credentials at that time so we can use
|
|
* them now.
|
|
*/
|
|
KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
|
|
("unp_connect: listener without cached peercred"));
|
|
memcpy(&unp->unp_peercred, &unp2->unp_peercred,
|
|
sizeof(unp->unp_peercred));
|
|
unp->unp_flags |= UNP_HAVEPC;
|
|
#ifdef MAC
|
|
SOCK_LOCK(so);
|
|
mac_set_socket_peer_from_socket(so, so3);
|
|
mac_set_socket_peer_from_socket(so3, so);
|
|
SOCK_UNLOCK(so);
|
|
#endif
|
|
|
|
so2 = so3;
|
|
}
|
|
error = unp_connect2(so, so2);
|
|
bad2:
|
|
UNP_UNLOCK();
|
|
mtx_lock(&Giant);
|
|
bad:
|
|
mtx_assert(&Giant, MA_OWNED);
|
|
if (vp != NULL)
|
|
vput(vp);
|
|
mtx_unlock(&Giant);
|
|
free(sa, M_SONAME);
|
|
UNP_LOCK();
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
unp_connect2(so, so2)
|
|
register struct socket *so;
|
|
register struct socket *so2;
|
|
{
|
|
register struct unpcb *unp = sotounpcb(so);
|
|
register struct unpcb *unp2;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
if (so2->so_type != so->so_type)
|
|
return (EPROTOTYPE);
|
|
unp2 = sotounpcb(so2);
|
|
unp->unp_conn = unp2;
|
|
switch (so->so_type) {
|
|
|
|
case SOCK_DGRAM:
|
|
LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
|
|
soisconnected(so);
|
|
break;
|
|
|
|
case SOCK_STREAM:
|
|
unp2->unp_conn = unp;
|
|
soisconnected(so);
|
|
soisconnected(so2);
|
|
break;
|
|
|
|
default:
|
|
panic("unp_connect2");
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
unp_disconnect(unp)
|
|
struct unpcb *unp;
|
|
{
|
|
register struct unpcb *unp2 = unp->unp_conn;
|
|
struct socket *so;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
if (unp2 == NULL)
|
|
return;
|
|
unp->unp_conn = NULL;
|
|
switch (unp->unp_socket->so_type) {
|
|
|
|
case SOCK_DGRAM:
|
|
LIST_REMOVE(unp, unp_reflink);
|
|
so = unp->unp_socket;
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED;
|
|
SOCK_UNLOCK(so);
|
|
break;
|
|
|
|
case SOCK_STREAM:
|
|
soisdisconnected(unp->unp_socket);
|
|
unp2->unp_conn = NULL;
|
|
soisdisconnected(unp2->unp_socket);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef notdef
|
|
void
|
|
unp_abort(unp)
|
|
struct unpcb *unp;
|
|
{
|
|
|
|
unp_detach(unp);
|
|
UNP_UNLOCK_ASSERT();
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* unp_pcblist() assumes that UNIX domain socket memory is never reclaimed
|
|
* by the zone (UMA_ZONE_NOFREE), and as such potentially stale pointers
|
|
* are safe to reference. It first scans the list of struct unpcb's to
|
|
* generate a pointer list, then it rescans its list one entry at a time to
|
|
* externalize and copyout. It checks the generation number to see if a
|
|
* struct unpcb has been reused, and will skip it if so.
|
|
*/
|
|
static int
|
|
unp_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n;
|
|
struct unpcb *unp, **unp_list;
|
|
unp_gen_t gencnt;
|
|
struct xunpgen *xug;
|
|
struct unp_head *head;
|
|
struct xunpcb *xu;
|
|
|
|
head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
|
|
|
|
/*
|
|
* The process of preparing the PCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == NULL) {
|
|
n = unp_count;
|
|
req->oldidx = 2 * (sizeof *xug)
|
|
+ (n + n/8) * sizeof(struct xunpcb);
|
|
return (0);
|
|
}
|
|
|
|
if (req->newptr != NULL)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
|
|
UNP_LOCK();
|
|
gencnt = unp_gencnt;
|
|
n = unp_count;
|
|
UNP_UNLOCK();
|
|
|
|
xug->xug_len = sizeof *xug;
|
|
xug->xug_count = n;
|
|
xug->xug_gen = gencnt;
|
|
xug->xug_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, xug, sizeof *xug);
|
|
if (error) {
|
|
free(xug, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
|
|
|
|
UNP_LOCK();
|
|
for (unp = LIST_FIRST(head), i = 0; unp && i < n;
|
|
unp = LIST_NEXT(unp, unp_link)) {
|
|
if (unp->unp_gencnt <= gencnt) {
|
|
if (cr_cansee(req->td->td_ucred,
|
|
unp->unp_socket->so_cred))
|
|
continue;
|
|
unp_list[i++] = unp;
|
|
}
|
|
}
|
|
UNP_UNLOCK();
|
|
n = i; /* in case we lost some during malloc */
|
|
|
|
error = 0;
|
|
xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
|
|
for (i = 0; i < n; i++) {
|
|
unp = unp_list[i];
|
|
if (unp->unp_gencnt <= gencnt) {
|
|
xu->xu_len = sizeof *xu;
|
|
xu->xu_unpp = unp;
|
|
/*
|
|
* XXX - need more locking here to protect against
|
|
* connect/disconnect races for SMP.
|
|
*/
|
|
if (unp->unp_addr != NULL)
|
|
bcopy(unp->unp_addr, &xu->xu_addr,
|
|
unp->unp_addr->sun_len);
|
|
if (unp->unp_conn != NULL &&
|
|
unp->unp_conn->unp_addr != NULL)
|
|
bcopy(unp->unp_conn->unp_addr,
|
|
&xu->xu_caddr,
|
|
unp->unp_conn->unp_addr->sun_len);
|
|
bcopy(unp, &xu->xu_unp, sizeof *unp);
|
|
sotoxsocket(unp->unp_socket, &xu->xu_socket);
|
|
error = SYSCTL_OUT(req, xu, sizeof *xu);
|
|
}
|
|
}
|
|
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, CTLFLAG_RD,
|
|
(caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
|
|
"List of active local datagram sockets");
|
|
SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
|
|
(caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
|
|
"List of active local stream sockets");
|
|
|
|
static void
|
|
unp_shutdown(unp)
|
|
struct unpcb *unp;
|
|
{
|
|
struct socket *so;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
|
|
(so = unp->unp_conn->unp_socket))
|
|
socantrcvmore(so);
|
|
}
|
|
|
|
static void
|
|
unp_drop(unp, errno)
|
|
struct unpcb *unp;
|
|
int errno;
|
|
{
|
|
struct socket *so = unp->unp_socket;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
so->so_error = errno;
|
|
unp_disconnect(unp);
|
|
}
|
|
|
|
#ifdef notdef
|
|
void
|
|
unp_drain()
|
|
{
|
|
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
unp_freerights(rp, fdcount)
|
|
struct file **rp;
|
|
int fdcount;
|
|
{
|
|
int i;
|
|
struct file *fp;
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
fp = *rp;
|
|
/*
|
|
* zero the pointer before calling
|
|
* unp_discard since it may end up
|
|
* in unp_gc()..
|
|
*/
|
|
*rp++ = 0;
|
|
unp_discard(fp);
|
|
}
|
|
}
|
|
|
|
int
|
|
unp_externalize(control, controlp)
|
|
struct mbuf *control, **controlp;
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
|
|
int i;
|
|
int *fdp;
|
|
struct file **rp;
|
|
struct file *fp;
|
|
void *data;
|
|
socklen_t clen = control->m_len, datalen;
|
|
int error, newfds;
|
|
int f;
|
|
u_int newlen;
|
|
|
|
UNP_UNLOCK_ASSERT();
|
|
|
|
error = 0;
|
|
if (controlp != NULL) /* controlp == NULL => free control messages */
|
|
*controlp = NULL;
|
|
|
|
while (cm != NULL) {
|
|
if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
data = CMSG_DATA(cm);
|
|
datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
|
|
|
|
if (cm->cmsg_level == SOL_SOCKET
|
|
&& cm->cmsg_type == SCM_RIGHTS) {
|
|
newfds = datalen / sizeof(struct file *);
|
|
rp = data;
|
|
|
|
/* If we're not outputting the descriptors free them. */
|
|
if (error || controlp == NULL) {
|
|
unp_freerights(rp, newfds);
|
|
goto next;
|
|
}
|
|
FILEDESC_LOCK(td->td_proc->p_fd);
|
|
/* if the new FD's will not fit free them. */
|
|
if (!fdavail(td, newfds)) {
|
|
FILEDESC_UNLOCK(td->td_proc->p_fd);
|
|
error = EMSGSIZE;
|
|
unp_freerights(rp, newfds);
|
|
goto next;
|
|
}
|
|
/*
|
|
* now change each pointer to an fd in the global
|
|
* table to an integer that is the index to the
|
|
* local fd table entry that we set up to point
|
|
* to the global one we are transferring.
|
|
*/
|
|
newlen = newfds * sizeof(int);
|
|
*controlp = sbcreatecontrol(NULL, newlen,
|
|
SCM_RIGHTS, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
FILEDESC_UNLOCK(td->td_proc->p_fd);
|
|
error = E2BIG;
|
|
unp_freerights(rp, newfds);
|
|
goto next;
|
|
}
|
|
|
|
fdp = (int *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
for (i = 0; i < newfds; i++) {
|
|
if (fdalloc(td, 0, &f))
|
|
panic("unp_externalize fdalloc failed");
|
|
fp = *rp++;
|
|
td->td_proc->p_fd->fd_ofiles[f] = fp;
|
|
FILE_LOCK(fp);
|
|
fp->f_msgcount--;
|
|
FILE_UNLOCK(fp);
|
|
unp_rights--;
|
|
*fdp++ = f;
|
|
}
|
|
FILEDESC_UNLOCK(td->td_proc->p_fd);
|
|
} else { /* We can just copy anything else across */
|
|
if (error || controlp == NULL)
|
|
goto next;
|
|
*controlp = sbcreatecontrol(NULL, datalen,
|
|
cm->cmsg_type, cm->cmsg_level);
|
|
if (*controlp == NULL) {
|
|
error = ENOBUFS;
|
|
goto next;
|
|
}
|
|
bcopy(data,
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
|
|
datalen);
|
|
}
|
|
|
|
controlp = &(*controlp)->m_next;
|
|
|
|
next:
|
|
if (CMSG_SPACE(datalen) < clen) {
|
|
clen -= CMSG_SPACE(datalen);
|
|
cm = (struct cmsghdr *)
|
|
((caddr_t)cm + CMSG_SPACE(datalen));
|
|
} else {
|
|
clen = 0;
|
|
cm = NULL;
|
|
}
|
|
}
|
|
|
|
m_freem(control);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
unp_init(void)
|
|
{
|
|
unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
|
|
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
|
|
if (unp_zone == NULL)
|
|
panic("unp_init");
|
|
uma_zone_set_max(unp_zone, nmbclusters);
|
|
LIST_INIT(&unp_dhead);
|
|
LIST_INIT(&unp_shead);
|
|
|
|
UNP_LOCK_INIT();
|
|
}
|
|
|
|
static int
|
|
unp_internalize(controlp, td)
|
|
struct mbuf **controlp;
|
|
struct thread *td;
|
|
{
|
|
struct mbuf *control = *controlp;
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdescp = p->p_fd;
|
|
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
|
|
struct cmsgcred *cmcred;
|
|
struct file **rp;
|
|
struct file *fp;
|
|
struct timeval *tv;
|
|
int i, fd, *fdp;
|
|
void *data;
|
|
socklen_t clen = control->m_len, datalen;
|
|
int error, oldfds;
|
|
u_int newlen;
|
|
|
|
UNP_UNLOCK_ASSERT();
|
|
|
|
error = 0;
|
|
*controlp = NULL;
|
|
|
|
while (cm != NULL) {
|
|
if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
|
|
|| cm->cmsg_len > clen) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
data = CMSG_DATA(cm);
|
|
datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
|
|
|
|
switch (cm->cmsg_type) {
|
|
/*
|
|
* Fill in credential information.
|
|
*/
|
|
case SCM_CREDS:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
|
|
SCM_CREDS, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
|
|
cmcred = (struct cmsgcred *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
cmcred->cmcred_pid = p->p_pid;
|
|
cmcred->cmcred_uid = td->td_ucred->cr_ruid;
|
|
cmcred->cmcred_gid = td->td_ucred->cr_rgid;
|
|
cmcred->cmcred_euid = td->td_ucred->cr_uid;
|
|
cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
|
|
CMGROUP_MAX);
|
|
for (i = 0; i < cmcred->cmcred_ngroups; i++)
|
|
cmcred->cmcred_groups[i] =
|
|
td->td_ucred->cr_groups[i];
|
|
break;
|
|
|
|
case SCM_RIGHTS:
|
|
oldfds = datalen / sizeof (int);
|
|
/*
|
|
* check that all the FDs passed in refer to legal files
|
|
* If not, reject the entire operation.
|
|
*/
|
|
fdp = data;
|
|
FILEDESC_LOCK(fdescp);
|
|
for (i = 0; i < oldfds; i++) {
|
|
fd = *fdp++;
|
|
if ((unsigned)fd >= fdescp->fd_nfiles ||
|
|
fdescp->fd_ofiles[fd] == NULL) {
|
|
FILEDESC_UNLOCK(fdescp);
|
|
error = EBADF;
|
|
goto out;
|
|
}
|
|
fp = fdescp->fd_ofiles[fd];
|
|
if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
|
|
FILEDESC_UNLOCK(fdescp);
|
|
error = EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
}
|
|
/*
|
|
* Now replace the integer FDs with pointers to
|
|
* the associated global file table entry..
|
|
*/
|
|
newlen = oldfds * sizeof(struct file *);
|
|
*controlp = sbcreatecontrol(NULL, newlen,
|
|
SCM_RIGHTS, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
FILEDESC_UNLOCK(fdescp);
|
|
error = E2BIG;
|
|
goto out;
|
|
}
|
|
|
|
fdp = data;
|
|
rp = (struct file **)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
for (i = 0; i < oldfds; i++) {
|
|
fp = fdescp->fd_ofiles[*fdp++];
|
|
*rp++ = fp;
|
|
FILE_LOCK(fp);
|
|
fp->f_count++;
|
|
fp->f_msgcount++;
|
|
FILE_UNLOCK(fp);
|
|
unp_rights++;
|
|
}
|
|
FILEDESC_UNLOCK(fdescp);
|
|
break;
|
|
|
|
case SCM_TIMESTAMP:
|
|
*controlp = sbcreatecontrol(NULL, sizeof(*tv),
|
|
SCM_TIMESTAMP, SOL_SOCKET);
|
|
if (*controlp == NULL) {
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
tv = (struct timeval *)
|
|
CMSG_DATA(mtod(*controlp, struct cmsghdr *));
|
|
microtime(tv);
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
controlp = &(*controlp)->m_next;
|
|
|
|
if (CMSG_SPACE(datalen) < clen) {
|
|
clen -= CMSG_SPACE(datalen);
|
|
cm = (struct cmsghdr *)
|
|
((caddr_t)cm + CMSG_SPACE(datalen));
|
|
} else {
|
|
clen = 0;
|
|
cm = NULL;
|
|
}
|
|
}
|
|
|
|
out:
|
|
m_freem(control);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* unp_defer is thread-local during garbage collection, and does not require
|
|
* explicit synchronization. unp_gcing prevents other threads from entering
|
|
* garbage collection, and perhaps should be an sx lock instead.
|
|
*/
|
|
static int unp_defer, unp_gcing;
|
|
|
|
static void
|
|
unp_gc()
|
|
{
|
|
register struct file *fp, *nextfp;
|
|
register struct socket *so;
|
|
struct file **extra_ref, **fpp;
|
|
int nunref, i;
|
|
int nfiles_snap;
|
|
int nfiles_slack = 20;
|
|
|
|
UNP_LOCK_ASSERT();
|
|
|
|
if (unp_gcing) {
|
|
UNP_UNLOCK();
|
|
return;
|
|
}
|
|
unp_gcing = 1;
|
|
unp_defer = 0;
|
|
UNP_UNLOCK();
|
|
/*
|
|
* before going through all this, set all FDs to
|
|
* be NOT defered and NOT externally accessible
|
|
*/
|
|
sx_slock(&filelist_lock);
|
|
LIST_FOREACH(fp, &filehead, f_list)
|
|
fp->f_gcflag &= ~(FMARK|FDEFER);
|
|
do {
|
|
LIST_FOREACH(fp, &filehead, f_list) {
|
|
FILE_LOCK(fp);
|
|
/*
|
|
* If the file is not open, skip it
|
|
*/
|
|
if (fp->f_count == 0) {
|
|
FILE_UNLOCK(fp);
|
|
continue;
|
|
}
|
|
/*
|
|
* If we already marked it as 'defer' in a
|
|
* previous pass, then try process it this time
|
|
* and un-mark it
|
|
*/
|
|
if (fp->f_gcflag & FDEFER) {
|
|
fp->f_gcflag &= ~FDEFER;
|
|
unp_defer--;
|
|
} else {
|
|
/*
|
|
* if it's not defered, then check if it's
|
|
* already marked.. if so skip it
|
|
*/
|
|
if (fp->f_gcflag & FMARK) {
|
|
FILE_UNLOCK(fp);
|
|
continue;
|
|
}
|
|
/*
|
|
* If all references are from messages
|
|
* in transit, then skip it. it's not
|
|
* externally accessible.
|
|
*/
|
|
if (fp->f_count == fp->f_msgcount) {
|
|
FILE_UNLOCK(fp);
|
|
continue;
|
|
}
|
|
/*
|
|
* If it got this far then it must be
|
|
* externally accessible.
|
|
*/
|
|
fp->f_gcflag |= FMARK;
|
|
}
|
|
/*
|
|
* either it was defered, or it is externally
|
|
* accessible and not already marked so.
|
|
* Now check if it is possibly one of OUR sockets.
|
|
*/
|
|
if (fp->f_type != DTYPE_SOCKET ||
|
|
(so = fp->f_data) == NULL) {
|
|
FILE_UNLOCK(fp);
|
|
continue;
|
|
}
|
|
FILE_UNLOCK(fp);
|
|
if (so->so_proto->pr_domain != &localdomain ||
|
|
(so->so_proto->pr_flags&PR_RIGHTS) == 0)
|
|
continue;
|
|
#ifdef notdef
|
|
if (so->so_rcv.sb_flags & SB_LOCK) {
|
|
/*
|
|
* This is problematical; it's not clear
|
|
* we need to wait for the sockbuf to be
|
|
* unlocked (on a uniprocessor, at least),
|
|
* and it's also not clear what to do
|
|
* if sbwait returns an error due to receipt
|
|
* of a signal. If sbwait does return
|
|
* an error, we'll go into an infinite
|
|
* loop. Delete all of this for now.
|
|
*/
|
|
(void) sbwait(&so->so_rcv);
|
|
goto restart;
|
|
}
|
|
#endif
|
|
/*
|
|
* So, Ok, it's one of our sockets and it IS externally
|
|
* accessible (or was defered). Now we look
|
|
* to see if we hold any file descriptors in its
|
|
* message buffers. Follow those links and mark them
|
|
* as accessible too.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
unp_scan(so->so_rcv.sb_mb, unp_mark);
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
}
|
|
} while (unp_defer);
|
|
sx_sunlock(&filelist_lock);
|
|
/*
|
|
* We grab an extra reference to each of the file table entries
|
|
* that are not otherwise accessible and then free the rights
|
|
* that are stored in messages on them.
|
|
*
|
|
* The bug in the orginal code is a little tricky, so I'll describe
|
|
* what's wrong with it here.
|
|
*
|
|
* It is incorrect to simply unp_discard each entry for f_msgcount
|
|
* times -- consider the case of sockets A and B that contain
|
|
* references to each other. On a last close of some other socket,
|
|
* we trigger a gc since the number of outstanding rights (unp_rights)
|
|
* is non-zero. If during the sweep phase the gc code un_discards,
|
|
* we end up doing a (full) closef on the descriptor. A closef on A
|
|
* results in the following chain. Closef calls soo_close, which
|
|
* calls soclose. Soclose calls first (through the switch
|
|
* uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
|
|
* returns because the previous instance had set unp_gcing, and
|
|
* we return all the way back to soclose, which marks the socket
|
|
* with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
|
|
* to free up the rights that are queued in messages on the socket A,
|
|
* i.e., the reference on B. The sorflush calls via the dom_dispose
|
|
* switch unp_dispose, which unp_scans with unp_discard. This second
|
|
* instance of unp_discard just calls closef on B.
|
|
*
|
|
* Well, a similar chain occurs on B, resulting in a sorflush on B,
|
|
* which results in another closef on A. Unfortunately, A is already
|
|
* being closed, and the descriptor has already been marked with
|
|
* SS_NOFDREF, and soclose panics at this point.
|
|
*
|
|
* Here, we first take an extra reference to each inaccessible
|
|
* descriptor. Then, we call sorflush ourself, since we know
|
|
* it is a Unix domain socket anyhow. After we destroy all the
|
|
* rights carried in messages, we do a last closef to get rid
|
|
* of our extra reference. This is the last close, and the
|
|
* unp_detach etc will shut down the socket.
|
|
*
|
|
* 91/09/19, bsy@cs.cmu.edu
|
|
*/
|
|
again:
|
|
nfiles_snap = openfiles + nfiles_slack; /* some slack */
|
|
extra_ref = malloc(nfiles_snap * sizeof(struct file *), M_TEMP,
|
|
M_WAITOK);
|
|
sx_slock(&filelist_lock);
|
|
if (nfiles_snap < openfiles) {
|
|
sx_sunlock(&filelist_lock);
|
|
free(extra_ref, M_TEMP);
|
|
nfiles_slack += 20;
|
|
goto again;
|
|
}
|
|
for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref;
|
|
fp != NULL; fp = nextfp) {
|
|
nextfp = LIST_NEXT(fp, f_list);
|
|
FILE_LOCK(fp);
|
|
/*
|
|
* If it's not open, skip it
|
|
*/
|
|
if (fp->f_count == 0) {
|
|
FILE_UNLOCK(fp);
|
|
continue;
|
|
}
|
|
/*
|
|
* If all refs are from msgs, and it's not marked accessible
|
|
* then it must be referenced from some unreachable cycle
|
|
* of (shut-down) FDs, so include it in our
|
|
* list of FDs to remove
|
|
*/
|
|
if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) {
|
|
*fpp++ = fp;
|
|
nunref++;
|
|
fp->f_count++;
|
|
}
|
|
FILE_UNLOCK(fp);
|
|
}
|
|
sx_sunlock(&filelist_lock);
|
|
/*
|
|
* for each FD on our hit list, do the following two things
|
|
*/
|
|
for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
|
|
struct file *tfp = *fpp;
|
|
FILE_LOCK(tfp);
|
|
if (tfp->f_type == DTYPE_SOCKET &&
|
|
tfp->f_data != NULL) {
|
|
FILE_UNLOCK(tfp);
|
|
sorflush(tfp->f_data);
|
|
} else {
|
|
FILE_UNLOCK(tfp);
|
|
}
|
|
}
|
|
for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
|
|
closef(*fpp, (struct thread *) NULL);
|
|
free(extra_ref, M_TEMP);
|
|
unp_gcing = 0;
|
|
|
|
UNP_UNLOCK_ASSERT();
|
|
}
|
|
|
|
void
|
|
unp_dispose(m)
|
|
struct mbuf *m;
|
|
{
|
|
|
|
if (m)
|
|
unp_scan(m, unp_discard);
|
|
}
|
|
|
|
static int
|
|
unp_listen(unp, td)
|
|
struct unpcb *unp;
|
|
struct thread *td;
|
|
{
|
|
UNP_LOCK_ASSERT();
|
|
|
|
/*
|
|
* XXXRW: Why populate the local peer cred with our own credential?
|
|
*/
|
|
cru2x(td->td_ucred, &unp->unp_peercred);
|
|
unp->unp_flags |= UNP_HAVEPCCACHED;
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
unp_scan(m0, op)
|
|
register struct mbuf *m0;
|
|
void (*op)(struct file *);
|
|
{
|
|
struct mbuf *m;
|
|
struct file **rp;
|
|
struct cmsghdr *cm;
|
|
void *data;
|
|
int i;
|
|
socklen_t clen, datalen;
|
|
int qfds;
|
|
|
|
while (m0 != NULL) {
|
|
for (m = m0; m; m = m->m_next) {
|
|
if (m->m_type != MT_CONTROL)
|
|
continue;
|
|
|
|
cm = mtod(m, struct cmsghdr *);
|
|
clen = m->m_len;
|
|
|
|
while (cm != NULL) {
|
|
if (sizeof(*cm) > clen || cm->cmsg_len > clen)
|
|
break;
|
|
|
|
data = CMSG_DATA(cm);
|
|
datalen = (caddr_t)cm + cm->cmsg_len
|
|
- (caddr_t)data;
|
|
|
|
if (cm->cmsg_level == SOL_SOCKET &&
|
|
cm->cmsg_type == SCM_RIGHTS) {
|
|
qfds = datalen / sizeof (struct file *);
|
|
rp = data;
|
|
for (i = 0; i < qfds; i++)
|
|
(*op)(*rp++);
|
|
}
|
|
|
|
if (CMSG_SPACE(datalen) < clen) {
|
|
clen -= CMSG_SPACE(datalen);
|
|
cm = (struct cmsghdr *)
|
|
((caddr_t)cm + CMSG_SPACE(datalen));
|
|
} else {
|
|
clen = 0;
|
|
cm = NULL;
|
|
}
|
|
}
|
|
}
|
|
m0 = m0->m_act;
|
|
}
|
|
}
|
|
|
|
static void
|
|
unp_mark(fp)
|
|
struct file *fp;
|
|
{
|
|
if (fp->f_gcflag & FMARK)
|
|
return;
|
|
unp_defer++;
|
|
fp->f_gcflag |= (FMARK|FDEFER);
|
|
}
|
|
|
|
static void
|
|
unp_discard(fp)
|
|
struct file *fp;
|
|
{
|
|
FILE_LOCK(fp);
|
|
fp->f_msgcount--;
|
|
unp_rights--;
|
|
FILE_UNLOCK(fp);
|
|
(void) closef(fp, (struct thread *)NULL);
|
|
}
|