1/* $NetBSD: sys_socket.c,v 1.74 2016/07/07 06:55:43 msaitoh Exp $ */
2
3/*-
4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Copyright (c) 1982, 1986, 1990, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)sys_socket.c 8.3 (Berkeley) 2/14/95
61 */
62
63#include <sys/cdefs.h>
64__KERNEL_RCSID(0, "$NetBSD: sys_socket.c,v 1.74 2016/07/07 06:55:43 msaitoh Exp $");
65
66#include <sys/param.h>
67#include <sys/systm.h>
68#include <sys/systm.h>
69#include <sys/file.h>
70#include <sys/mbuf.h>
71#include <sys/protosw.h>
72#include <sys/socket.h>
73#include <sys/socketvar.h>
74#include <sys/ioctl.h>
75#include <sys/stat.h>
76#include <sys/poll.h>
77#include <sys/proc.h>
78#include <sys/kauth.h>
79
80#include <net/if.h>
81#include <net/route.h>
82
83const struct fileops socketops = {
84 .fo_read = soo_read,
85 .fo_write = soo_write,
86 .fo_ioctl = soo_ioctl,
87 .fo_fcntl = soo_fcntl,
88 .fo_poll = soo_poll,
89 .fo_stat = soo_stat,
90 .fo_close = soo_close,
91 .fo_kqfilter = soo_kqfilter,
92 .fo_restart = soo_restart,
93};
94
95int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp;
96
97/* ARGSUSED */
98int
99soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
100 int flags)
101{
102 struct socket *so = fp->f_socket;
103 int error;
104
105 error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL);
106
107 return error;
108}
109
110/* ARGSUSED */
111int
112soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
113 int flags)
114{
115 struct socket *so = fp->f_socket;
116 int error;
117
118 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp);
119
120 return error;
121}
122
123int
124soo_ioctl(file_t *fp, u_long cmd, void *data)
125{
126 struct socket *so = fp->f_socket;
127 int error = 0;
128
129 switch (cmd) {
130
131 case FIONBIO:
132 solock(so);
133 if (*(int *)data)
134 so->so_state |= SS_NBIO;
135 else
136 so->so_state &= ~SS_NBIO;
137 sounlock(so);
138 break;
139
140 case FIOASYNC:
141 solock(so);
142 if (*(int *)data) {
143 so->so_state |= SS_ASYNC;
144 so->so_rcv.sb_flags |= SB_ASYNC;
145 so->so_snd.sb_flags |= SB_ASYNC;
146 } else {
147 so->so_state &= ~SS_ASYNC;
148 so->so_rcv.sb_flags &= ~SB_ASYNC;
149 so->so_snd.sb_flags &= ~SB_ASYNC;
150 }
151 sounlock(so);
152 break;
153
154 case FIONREAD:
155 *(int *)data = so->so_rcv.sb_cc;
156 break;
157
158 case FIONWRITE:
159 *(int *)data = so->so_snd.sb_cc;
160 break;
161
162 case FIONSPACE:
163 /*
164 * See the comment around sbspace()'s definition
165 * in sys/socketvar.h in face of counts about maximum
166 * to understand the following test. We detect overflow
167 * and return zero.
168 */
169 solock(so);
170 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc)
171 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
172 *(int *)data = 0;
173 else
174 *(int *)data = sbspace(&so->so_snd);
175 sounlock(so);
176 break;
177
178 case SIOCSPGRP:
179 case FIOSETOWN:
180 case TIOCSPGRP:
181 error = fsetown(&so->so_pgid, cmd, data);
182 break;
183
184 case SIOCGPGRP:
185 case FIOGETOWN:
186 case TIOCGPGRP:
187 error = fgetown(so->so_pgid, cmd, data);
188 break;
189
190 case SIOCATMARK:
191 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
192 break;
193
194 default:
195 /*
196 * Interface/routing/protocol specific ioctls:
197 * interface and routing ioctls should have a
198 * different entry since a socket's unnecessary
199 */
200 KERNEL_LOCK(1, NULL);
201 if (IOCGROUP(cmd) == 'i')
202 error = ifioctl(so, cmd, data, curlwp);
203 else {
204 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so,
205 cmd, data, NULL);
206 }
207 KERNEL_UNLOCK_ONE(NULL);
208 break;
209 }
210
211
212 return error;
213}
214
215int
216soo_fcntl(file_t *fp, u_int cmd, void *data)
217{
218
219 if (cmd == F_SETFL)
220 return 0;
221 else
222 return EOPNOTSUPP;
223}
224
225int
226soo_poll(file_t *fp, int events)
227{
228
229 return sopoll(fp->f_socket, events);
230}
231
232int
233soo_stat(file_t *fp, struct stat *ub)
234{
235 struct socket *so = fp->f_socket;
236 int error;
237
238 memset(ub, 0, sizeof(*ub));
239 ub->st_mode = S_IFSOCK;
240
241 solock(so);
242 error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub);
243 sounlock(so);
244
245 return error;
246}
247
248/* ARGSUSED */
249int
250soo_close(file_t *fp)
251{
252 int error = 0;
253
254 if (fp->f_socket)
255 error = soclose(fp->f_socket);
256 fp->f_socket = NULL;
257
258 return error;
259}
260
261void
262soo_restart(file_t *fp)
263{
264
265 sorestart(fp->f_socket);
266}
267