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a6719c82b1
Giant conditional on debug.mpsafenet in the socket soo_stat() routine, unconditionally in vn_statfile() for VFS, and otherwise don't acquire Giant. Accept an unlocked read in kqueue_stat(), and cryptof_stat() is a no-op. Don't acquire Giant in fstat() system call. Note: in fdescfs, fo_stat() is called while holding Giant due to the VFS stack sitting on top, and therefore there will still be Giant recursion in this case.
279 lines
6.9 KiB
C
279 lines
6.9 KiB
C
/*
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* Copyright (c) 1982, 1986, 1990, 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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* @(#)sys_socket.c 8.1 (Berkeley) 6/10/93
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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/systm.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/mac.h>
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#include <sys/protosw.h>
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#include <sys/sigio.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/filio.h> /* XXX */
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#include <sys/sockio.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/ucred.h>
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#include <net/if.h>
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#include <net/route.h>
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struct fileops socketops = {
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.fo_read = soo_read,
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.fo_write = soo_write,
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.fo_ioctl = soo_ioctl,
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.fo_poll = soo_poll,
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.fo_kqfilter = soo_kqfilter,
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.fo_stat = soo_stat,
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.fo_close = soo_close,
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.fo_flags = DFLAG_PASSABLE
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};
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/* ARGSUSED */
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int
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soo_read(fp, uio, active_cred, flags, td)
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struct file *fp;
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struct uio *uio;
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struct ucred *active_cred;
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struct thread *td;
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int flags;
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{
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struct socket *so = fp->f_data;
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int error;
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NET_LOCK_GIANT();
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#ifdef MAC
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SOCK_LOCK(so);
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error = mac_check_socket_receive(active_cred, so);
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SOCK_UNLOCK(so);
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if (error) {
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NET_UNLOCK_GIANT();
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return (error);
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}
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#endif
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error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0);
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NET_UNLOCK_GIANT();
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return (error);
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}
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/* ARGSUSED */
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int
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soo_write(fp, uio, active_cred, flags, td)
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struct file *fp;
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struct uio *uio;
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struct ucred *active_cred;
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struct thread *td;
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int flags;
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{
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struct socket *so = fp->f_data;
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int error;
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NET_LOCK_GIANT();
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#ifdef MAC
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SOCK_LOCK(so);
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error = mac_check_socket_send(active_cred, so);
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SOCK_UNLOCK(so);
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if (error) {
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NET_UNLOCK_GIANT();
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return (error);
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}
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#endif
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error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0,
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uio->uio_td);
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NET_UNLOCK_GIANT();
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return (error);
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}
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int
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soo_ioctl(fp, cmd, data, active_cred, td)
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struct file *fp;
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u_long cmd;
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void *data;
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struct ucred *active_cred;
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struct thread *td;
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{
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register struct socket *so = fp->f_data;
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switch (cmd) {
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case FIONBIO:
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SOCK_LOCK(so);
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if (*(int *)data)
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so->so_state |= SS_NBIO;
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else
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so->so_state &= ~SS_NBIO;
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SOCK_UNLOCK(so);
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return (0);
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case FIOASYNC:
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/*
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* XXXRW: This code separately acquires SOCK_LOCK(so)
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* and SOCKBUF_LOCK(&so->so_rcv) even though they are
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* the same mutex to avoid introducing the assumption
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* that they are the same.
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*/
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if (*(int *)data) {
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SOCK_LOCK(so);
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so->so_state |= SS_ASYNC;
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SOCK_UNLOCK(so);
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SOCKBUF_LOCK(&so->so_rcv);
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so->so_rcv.sb_flags |= SB_ASYNC;
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SOCKBUF_UNLOCK(&so->so_rcv);
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SOCKBUF_LOCK(&so->so_snd);
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so->so_snd.sb_flags |= SB_ASYNC;
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SOCKBUF_UNLOCK(&so->so_snd);
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} else {
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SOCK_LOCK(so);
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so->so_state &= ~SS_ASYNC;
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SOCK_UNLOCK(so);
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SOCKBUF_LOCK(&so->so_rcv);
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so->so_rcv.sb_flags &= ~SB_ASYNC;
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SOCKBUF_UNLOCK(&so->so_rcv);
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SOCKBUF_LOCK(&so->so_snd);
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so->so_snd.sb_flags &= ~SB_ASYNC;
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SOCKBUF_UNLOCK(&so->so_snd);
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}
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return (0);
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case FIONREAD:
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/* Unlocked read. */
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*(int *)data = so->so_rcv.sb_cc;
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return (0);
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case FIOSETOWN:
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return (fsetown(*(int *)data, &so->so_sigio));
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case FIOGETOWN:
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*(int *)data = fgetown(&so->so_sigio);
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return (0);
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case SIOCSPGRP:
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return (fsetown(-(*(int *)data), &so->so_sigio));
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case SIOCGPGRP:
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*(int *)data = -fgetown(&so->so_sigio);
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return (0);
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case SIOCATMARK:
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/* Unlocked read. */
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*(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
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return (0);
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}
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/*
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* Interface/routing/protocol specific ioctls:
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* interface and routing ioctls should have a
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* different entry since a socket's unnecessary
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*/
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if (IOCGROUP(cmd) == 'i')
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return (ifioctl(so, cmd, data, td));
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if (IOCGROUP(cmd) == 'r')
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return (rtioctl(cmd, data));
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return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, 0, td));
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}
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int
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soo_poll(fp, events, active_cred, td)
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struct file *fp;
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int events;
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struct ucred *active_cred;
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struct thread *td;
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{
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struct socket *so = fp->f_data;
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return so->so_proto->pr_usrreqs->pru_sopoll(so, events,
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fp->f_cred, td);
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}
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int
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soo_stat(fp, ub, active_cred, td)
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struct file *fp;
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struct stat *ub;
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struct ucred *active_cred;
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struct thread *td;
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{
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struct socket *so = fp->f_data;
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int error;
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bzero((caddr_t)ub, sizeof (*ub));
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ub->st_mode = S_IFSOCK;
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NET_LOCK_GIANT();
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/*
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* If SBS_CANTRCVMORE is set, but there's still data left in the
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* receive buffer, the socket is still readable.
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*
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* XXXRW: perhaps should lock socket buffer so st_size result
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* is consistent.
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*/
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/* Unlocked read. */
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if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
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so->so_rcv.sb_cc != 0)
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ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
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if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
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ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
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ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
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ub->st_uid = so->so_cred->cr_uid;
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ub->st_gid = so->so_cred->cr_gid;
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error = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
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NET_UNLOCK_GIANT();
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return (error);
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}
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/*
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* API socket close on file pointer. We call soclose() to close the
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* socket (including initiating closing protocols). soclose() will
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* sorele() the file reference but the actual socket will not go away
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* until the socket's ref count hits 0.
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*/
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/* ARGSUSED */
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int
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soo_close(fp, td)
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struct file *fp;
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struct thread *td;
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{
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int error = 0;
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struct socket *so;
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NET_LOCK_GIANT();
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so = fp->f_data;
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fp->f_ops = &badfileops;
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fp->f_data = NULL;
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if (so)
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error = soclose(so);
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NET_UNLOCK_GIANT();
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return (error);
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}
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