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
49 const 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
58 int
soo_read(struct file * fp,struct uio * uio,int fflags)59 soo_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
70 int
soo_write(struct file * fp,struct uio * uio,int fflags)71 soo_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
82 int
soo_ioctl(struct file * fp,u_long cmd,caddr_t data,struct proc * p)83 soo_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
143 int
soo_stat(struct file * fp,struct stat * ub,struct proc * p)144 soo_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
165 int
soo_close(struct file * fp,struct proc * p)166 soo_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