NetBSD/sys/kern/sys_socket.c

291 lines
7.3 KiB
C

/* $NetBSD: sys_socket.c,v 1.81 2023/04/22 13:53:02 riastradh Exp $ */
/*-
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* 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.
* 3. 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 8.3 (Berkeley) 2/14/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_socket.c,v 1.81 2023/04/22 13:53:02 riastradh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <net/if.h>
#include <net/route.h>
static int soo_fpathconf(struct file *, int, register_t *);
static int soo_posix_fadvise(struct file *, off_t, off_t, int);
const struct fileops socketops = {
.fo_name = "socket",
.fo_read = soo_read,
.fo_write = soo_write,
.fo_ioctl = soo_ioctl,
.fo_fcntl = fnullop_fcntl,
.fo_poll = soo_poll,
.fo_stat = soo_stat,
.fo_close = soo_close,
.fo_kqfilter = soo_kqfilter,
.fo_restart = soo_restart,
.fo_fpathconf = soo_fpathconf,
.fo_posix_fadvise = soo_posix_fadvise,
};
int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp;
/* ARGSUSED */
int
soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
int flags)
{
struct socket *so = fp->f_socket;
int error;
error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL);
return error;
}
/* ARGSUSED */
int
soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
int flags)
{
struct socket *so = fp->f_socket;
int error;
error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp);
return error;
}
int
soo_ioctl(file_t *fp, u_long cmd, void *data)
{
struct socket *so = fp->f_socket;
int error = 0;
switch (cmd) {
case FIONBIO:
solock(so);
if (*(int *)data)
so->so_state |= SS_NBIO;
else
so->so_state &= ~SS_NBIO;
sounlock(so);
break;
case FIOASYNC:
solock(so);
if (*(int *)data) {
so->so_rcv.sb_flags |= SB_ASYNC;
so->so_snd.sb_flags |= SB_ASYNC;
} else {
so->so_rcv.sb_flags &= ~SB_ASYNC;
so->so_snd.sb_flags &= ~SB_ASYNC;
}
sounlock(so);
break;
case FIONREAD:
*(int *)data = so->so_rcv.sb_cc;
break;
case FIONWRITE:
*(int *)data = so->so_snd.sb_cc;
break;
case FIONSPACE:
/*
* See the comment around sbspace()'s definition
* in sys/socketvar.h in face of counts about maximum
* to understand the following test. We detect overflow
* and return zero.
*/
solock(so);
if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc)
|| (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
*(int *)data = 0;
else
*(int *)data = sbspace(&so->so_snd);
sounlock(so);
break;
case SIOCSPGRP:
case FIOSETOWN:
case TIOCSPGRP:
error = fsetown(&so->so_pgid, cmd, data);
break;
case SIOCGPGRP:
case FIOGETOWN:
case TIOCGPGRP:
error = fgetown(so->so_pgid, cmd, data);
break;
case SIOCATMARK:
*(int *)data = (so->so_state&SS_RCVATMARK) != 0;
break;
case SIOCPEELOFF:
solock(so);
error = do_sys_peeloff(so, data);
sounlock(so);
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')
/*
* KERNEL_LOCK will be held later if if_ioctl() of the
* interface isn't MP-safe.
*/
error = ifioctl(so, cmd, data, curlwp);
else {
KERNEL_LOCK(1, NULL);
error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so,
cmd, data, NULL);
KERNEL_UNLOCK_ONE(NULL);
}
break;
}
return error;
}
int
soo_poll(file_t *fp, int events)
{
return sopoll(fp->f_socket, events);
}
int
soo_stat(file_t *fp, struct stat *ub)
{
struct socket *so = fp->f_socket;
int error;
memset(ub, 0, sizeof(*ub));
ub->st_mode = S_IFSOCK;
solock(so);
error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub);
sounlock(so);
return error;
}
/* ARGSUSED */
int
soo_close(file_t *fp)
{
int error = 0;
if (fp->f_socket)
error = soclose(fp->f_socket);
fp->f_socket = NULL;
return error;
}
void
soo_restart(file_t *fp)
{
sorestart(fp->f_socket);
}
static int
soo_fpathconf(struct file *fp, int name, register_t *retval)
{
switch (name) {
case _PC_PIPE_BUF:
*retval = PIPE_BUF;
return 0;
default:
return EINVAL;
}
}
static int
soo_posix_fadvise(struct file *fp, off_t offset, off_t len, int advice)
{
return ESPIPE;
}