1/*	$OpenBSD: sys_socket.c,v 1.65 2024/04/30 17:59:15 mvs Exp $	*/
2/*	$NetBSD: sys_socket.c,v 1.13 1995/08/12 23:59:09 mycroft Exp $	*/
3
4/*
5 * Copyright (c) 1982, 1986, 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)sys_socket.c	8.1 (Berkeley) 6/10/93
33 */
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/file.h>
38#include <sys/proc.h>
39#include <sys/mbuf.h>
40#include <sys/protosw.h>
41#include <sys/socket.h>
42#include <sys/socketvar.h>
43#include <sys/ioctl.h>
44#include <sys/stat.h>
45#include <sys/fcntl.h>
46
47#include <net/if.h>
48
49const struct fileops socketops = {
50	.fo_read	= soo_read,
51	.fo_write	= soo_write,
52	.fo_ioctl	= soo_ioctl,
53	.fo_kqfilter	= soo_kqfilter,
54	.fo_stat	= soo_stat,
55	.fo_close	= soo_close
56};
57
58int
59soo_read(struct file *fp, struct uio *uio, int fflags)
60{
61	struct socket *so = (struct socket *)fp->f_data;
62	int flags = 0;
63
64	if (fp->f_flag & FNONBLOCK)
65		flags |= MSG_DONTWAIT;
66
67	return (soreceive(so, NULL, uio, NULL, NULL, &flags, 0));
68}
69
70int
71soo_write(struct file *fp, struct uio *uio, int fflags)
72{
73	struct socket *so = (struct socket *)fp->f_data;
74	int flags = 0;
75
76	if (fp->f_flag & FNONBLOCK)
77		flags |= MSG_DONTWAIT;
78
79	return (sosend(so, NULL, uio, NULL, NULL, flags));
80}
81
82int
83soo_ioctl(struct file *fp, u_long cmd, caddr_t data, struct proc *p)
84{
85	struct socket *so = (struct socket *)fp->f_data;
86
87	switch (cmd) {
88
89	case FIONBIO:
90		break;
91
92	case FIOASYNC:
93		solock(so);
94		mtx_enter(&so->so_rcv.sb_mtx);
95		mtx_enter(&so->so_snd.sb_mtx);
96		if (*(int *)data) {
97			so->so_rcv.sb_flags |= SB_ASYNC;
98			so->so_snd.sb_flags |= SB_ASYNC;
99		} else {
100			so->so_rcv.sb_flags &= ~SB_ASYNC;
101			so->so_snd.sb_flags &= ~SB_ASYNC;
102		}
103		mtx_leave(&so->so_snd.sb_mtx);
104		mtx_leave(&so->so_rcv.sb_mtx);
105		sounlock(so);
106		break;
107
108	case FIONREAD:
109		*(int *)data = so->so_rcv.sb_datacc;
110		break;
111
112	case FIOSETOWN:
113	case SIOCSPGRP:
114	case TIOCSPGRP:
115		return sigio_setown(&so->so_sigio, cmd, data);
116
117	case FIOGETOWN:
118	case SIOCGPGRP:
119	case TIOCGPGRP:
120		sigio_getown(&so->so_sigio, cmd, data);
121		break;
122
123	case SIOCATMARK:
124		*(int *)data = (so->so_rcv.sb_state & SS_RCVATMARK) != 0;
125		break;
126
127	default:
128		/*
129		 * Interface/routing/protocol specific ioctls:
130		 * interface and routing ioctls should have a
131		 * different entry since a socket's unnecessary
132		 */
133		if (IOCGROUP(cmd) == 'i')
134			return ifioctl(so, cmd, data, p);
135		if (IOCGROUP(cmd) == 'r')
136			return (EOPNOTSUPP);
137		return pru_control(so, cmd, data, NULL);
138	}
139
140	return (0);
141}
142
143int
144soo_stat(struct file *fp, struct stat *ub, struct proc *p)
145{
146	struct socket *so = fp->f_data;
147
148	memset(ub, 0, sizeof (*ub));
149	ub->st_mode = S_IFSOCK;
150	solock_shared(so);
151	mtx_enter(&so->so_rcv.sb_mtx);
152	if ((so->so_rcv.sb_state & SS_CANTRCVMORE) == 0 ||
153	    so->so_rcv.sb_cc != 0)
154		ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
155	mtx_leave(&so->so_rcv.sb_mtx);
156	if ((so->so_snd.sb_state & SS_CANTSENDMORE) == 0)
157		ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
158	ub->st_uid = so->so_euid;
159	ub->st_gid = so->so_egid;
160	(void)pru_sense(so, ub);
161	sounlock_shared(so);
162	return (0);
163}
164
165int
166soo_close(struct file *fp, struct proc *p)
167{
168	int flags, error = 0;
169
170	if (fp->f_data) {
171		flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0;
172		error = soclose(fp->f_data, flags);
173	}
174	fp->f_data = NULL;
175	return (error);
176}
177