FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_socket.c
1 /* $OpenBSD: sys_socket.c,v 1.60 2023/01/22 12:05:44 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
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
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
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 int error = 0;
87
88 switch (cmd) {
89
90 case FIONBIO:
91 break;
92
93 case FIOASYNC:
94 solock(so);
95 if (*(int *)data) {
96 so->so_rcv.sb_flags |= SB_ASYNC;
97 so->so_snd.sb_flags |= SB_ASYNC;
98 } else {
99 so->so_rcv.sb_flags &= ~SB_ASYNC;
100 so->so_snd.sb_flags &= ~SB_ASYNC;
101 }
102 sounlock(so);
103 break;
104
105 case FIONREAD:
106 *(int *)data = so->so_rcv.sb_datacc;
107 break;
108
109 case FIOSETOWN:
110 case SIOCSPGRP:
111 case TIOCSPGRP:
112 error = sigio_setown(&so->so_sigio, cmd, data);
113 break;
114
115 case FIOGETOWN:
116 case SIOCGPGRP:
117 case TIOCGPGRP:
118 sigio_getown(&so->so_sigio, cmd, data);
119 break;
120
121 case SIOCATMARK:
122 *(int *)data = (so->so_rcv.sb_state & SS_RCVATMARK) != 0;
123 break;
124
125 default:
126 /*
127 * Interface/routing/protocol specific ioctls:
128 * interface and routing ioctls should have a
129 * different entry since a socket's unnecessary
130 */
131 if (IOCGROUP(cmd) == 'i') {
132 error = ifioctl(so, cmd, data, p);
133 return (error);
134 }
135 if (IOCGROUP(cmd) == 'r')
136 return (EOPNOTSUPP);
137 error = pru_control(so, cmd, data, NULL);
138 break;
139 }
140
141 return (error);
142 }
143
144 int
145 soo_stat(struct file *fp, struct stat *ub, struct proc *p)
146 {
147 struct socket *so = fp->f_data;
148
149 memset(ub, 0, sizeof (*ub));
150 ub->st_mode = S_IFSOCK;
151 solock(so);
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 if ((so->so_snd.sb_state & SS_CANTSENDMORE) == 0)
156 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
157 ub->st_uid = so->so_euid;
158 ub->st_gid = so->so_egid;
159 (void)pru_sense(so, ub);
160 sounlock(so);
161 return (0);
162 }
163
164 int
165 soo_close(struct file *fp, struct proc *p)
166 {
167 int flags, error = 0;
168
169 if (fp->f_data) {
170 flags = (fp->f_flag & FNONBLOCK) ? MSG_DONTWAIT : 0;
171 error = soclose(fp->f_data, flags);
172 }
173 fp->f_data = NULL;
174 return (error);
175 }
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