freebsd/sys/kern/sys_socket.c

/*-
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)sys_socket.c	8.1 (Berkeley) 6/10/93
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_mac.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/mac.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/sigio.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/filio.h>			/* XXX */
#include <sys/sockio.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <sys/ucred.h>

#include <net/if.h>
#include <net/route.h>

struct	fileops socketops = {
	.fo_read = soo_read,
	.fo_write = soo_write,
	.fo_ioctl = soo_ioctl,
	.fo_poll = soo_poll,
	.fo_kqfilter = soo_kqfilter,
	.fo_stat = soo_stat,
	.fo_close = soo_close,
	.fo_flags = DFLAG_PASSABLE
};

/* ARGSUSED */
int
soo_read(fp, uio, active_cred, flags, td)
	struct file *fp;
	struct uio *uio;
	struct ucred *active_cred;
	struct thread *td;
	int flags;
{
	struct socket *so = fp->f_data;
	int error;

	NET_LOCK_GIANT();
#ifdef MAC
	SOCK_LOCK(so);
	error = mac_check_socket_receive(active_cred, so);
	SOCK_UNLOCK(so);
	if (error) {
		NET_UNLOCK_GIANT();
		return (error);
	}
#endif
	error = so->so_proto->pr_usrreqs->pru_soreceive(so, 0, uio, 0, 0, 0);
	NET_UNLOCK_GIANT();
	return (error);
}

/* ARGSUSED */
int
soo_write(fp, uio, active_cred, flags, td)
	struct file *fp;
	struct uio *uio;
	struct ucred *active_cred;
	struct thread *td;
	int flags;
{
	struct socket *so = fp->f_data;
	int error;

	NET_LOCK_GIANT();
#ifdef MAC
	SOCK_LOCK(so);
	error = mac_check_socket_send(active_cred, so);
	SOCK_UNLOCK(so);
	if (error) {
		NET_UNLOCK_GIANT();
		return (error);
	}
#endif
	error = so->so_proto->pr_usrreqs->pru_sosend(so, 0, uio, 0, 0, 0,
						    uio->uio_td);
	if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) {
		PROC_LOCK(uio->uio_td->td_proc);
		psignal(uio->uio_td->td_proc, SIGPIPE);
		PROC_UNLOCK(uio->uio_td->td_proc);
	}
	NET_UNLOCK_GIANT();
	return (error);
}

int
soo_ioctl(fp, cmd, data, active_cred, td)
	struct file *fp;
	u_long cmd;
	void *data;
	struct ucred *active_cred;
	struct thread *td;
{
	struct socket *so = fp->f_data;
	int error = 0;

	NET_LOCK_GIANT();
	switch (cmd) {

	case FIONBIO:
		SOCK_LOCK(so);
		if (*(int *)data)
			so->so_state |= SS_NBIO;
		else
			so->so_state &= ~SS_NBIO;
		SOCK_UNLOCK(so);
		break;

	case FIOASYNC:
		/*
		 * XXXRW: This code separately acquires SOCK_LOCK(so)
		 * and SOCKBUF_LOCK(&so->so_rcv) even though they are
		 * the same mutex to avoid introducing the assumption
		 * that they are the same.
		 */
		if (*(int *)data) {
			SOCK_LOCK(so);
			so->so_state |= SS_ASYNC;
			SOCK_UNLOCK(so);
			SOCKBUF_LOCK(&so->so_rcv);
			so->so_rcv.sb_flags |= SB_ASYNC;
			SOCKBUF_UNLOCK(&so->so_rcv);
			SOCKBUF_LOCK(&so->so_snd);
			so->so_snd.sb_flags |= SB_ASYNC;
			SOCKBUF_UNLOCK(&so->so_snd);
		} else {
			SOCK_LOCK(so);
			so->so_state &= ~SS_ASYNC;
			SOCK_UNLOCK(so);
			SOCKBUF_LOCK(&so->so_rcv);
			so->so_rcv.sb_flags &= ~SB_ASYNC;
			SOCKBUF_UNLOCK(&so->so_rcv);
			SOCKBUF_LOCK(&so->so_snd);
			so->so_snd.sb_flags &= ~SB_ASYNC;
			SOCKBUF_UNLOCK(&so->so_snd);
		}
		break;

	case FIONREAD:
		/* Unlocked read. */
		*(int *)data = so->so_rcv.sb_cc;
		break;

	case FIOSETOWN:
		error = fsetown(*(int *)data, &so->so_sigio);
		break;

	case FIOGETOWN:
		*(int *)data = fgetown(&so->so_sigio);
		break;

	case SIOCSPGRP:
		error = fsetown(-(*(int *)data), &so->so_sigio);
		break;

	case SIOCGPGRP:
		*(int *)data = -fgetown(&so->so_sigio);
		break;

	case SIOCATMARK:
		/* Unlocked read. */
		*(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
		break;
	default:
		/*
		 * Interface/routing/protocol specific ioctls:
		 * interface and routing ioctls should have a
		 * different entry since a socket's unnecessary
		 */
		if (IOCGROUP(cmd) == 'i')
			error = ifioctl(so, cmd, data, td);
		else if (IOCGROUP(cmd) == 'r')
			error = rtioctl(cmd, data);
		else
			error = ((*so->so_proto->pr_usrreqs->pru_control)
			    (so, cmd, data, 0, td));
		break;
	}
	NET_UNLOCK_GIANT();
	return(error);
}

int
soo_poll(fp, events, active_cred, td)
	struct file *fp;
	int events;
	struct ucred *active_cred;
	struct thread *td;
{
	struct socket *so = fp->f_data;
	int error;

	NET_LOCK_GIANT();
#ifdef MAC
	SOCK_LOCK(so);
	error = mac_check_socket_poll(active_cred, so);
	SOCK_UNLOCK(so);
	if (error) {
		NET_UNLOCK_GIANT();
		return (error);
	}
#endif
	error = (so->so_proto->pr_usrreqs->pru_sopoll)
	    (so, events, fp->f_cred, td);
	NET_UNLOCK_GIANT();

	return (error);
}

int
soo_stat(fp, ub, active_cred, td)
	struct file *fp;
	struct stat *ub;
	struct ucred *active_cred;
	struct thread *td;
{
	struct socket *so = fp->f_data;
	int error;

	bzero((caddr_t)ub, sizeof (*ub));
	ub->st_mode = S_IFSOCK;
	NET_LOCK_GIANT();
#ifdef MAC
	SOCK_LOCK(so);
	error = mac_check_socket_stat(active_cred, so);
	SOCK_UNLOCK(so);
	if (error) {
		NET_UNLOCK_GIANT();
		return (error);
	}
#endif
	/*
	 * If SBS_CANTRCVMORE is set, but there's still data left in the
	 * receive buffer, the socket is still readable.
	 *
	 * XXXRW: perhaps should lock socket buffer so st_size result
	 * is consistent.
	 */
	/* Unlocked read. */
	if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
	    so->so_rcv.sb_cc != 0)
		ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
	if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
		ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
	ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
	ub->st_uid = so->so_cred->cr_uid;
	ub->st_gid = so->so_cred->cr_gid;
	error = (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
	NET_UNLOCK_GIANT();
	return (error);
}

/*
 * API socket close on file pointer.  We call soclose() to close the 
 * socket (including initiating closing protocols).  soclose() will
 * sorele() the file reference but the actual socket will not go away
 * until the socket's ref count hits 0.
 */
/* ARGSUSED */
int
soo_close(fp, td)
	struct file *fp;
	struct thread *td;
{
	int error = 0;
	struct socket *so;

	NET_LOCK_GIANT();
	so = fp->f_data;
	fp->f_ops = &badfileops;
	fp->f_data = NULL;

	if (so)
		error = soclose(so);
	NET_UNLOCK_GIANT();
	return (error);
}