1 /* $NetBSD: sys_socket.c,v 1.84 2024/12/06 18:44:00 riastradh 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 1.84 2024/12/06 18:44:00 riastradh Exp $");
65
66 #include <sys/param.h>
67 #include <sys/types.h>
68
69 #include <sys/file.h>
70 #include <sys/ioctl.h>
71 #include <sys/kauth.h>
72 #include <sys/mbuf.h>
73 #include <sys/poll.h>
74 #include <sys/proc.h>
75 #include <sys/protosw.h>
76 #include <sys/sdt.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/stat.h>
80 #include <sys/systm.h>
81
82 #include <net/if.h>
83 #include <net/route.h>
84
85 static int soo_fpathconf(struct file *, int, register_t *);
86 static int soo_posix_fadvise(struct file *, off_t, off_t, int);
87
88 const struct fileops socketops = {
89 .fo_name = "socket",
90 .fo_read = soo_read,
91 .fo_write = soo_write,
92 .fo_ioctl = soo_ioctl,
93 .fo_fcntl = fnullop_fcntl,
94 .fo_poll = soo_poll,
95 .fo_stat = soo_stat,
96 .fo_close = soo_close,
97 .fo_kqfilter = soo_kqfilter,
98 .fo_restart = soo_restart,
99 .fo_fpathconf = soo_fpathconf,
100 .fo_posix_fadvise = soo_posix_fadvise,
101 };
102
103 int (*ifioctl)(struct socket *, u_long, void *, struct lwp *) = (void *)eopnotsupp;
104
105 /* ARGSUSED */
106 int
soo_read(file_t * fp,off_t * offset,struct uio * uio,kauth_cred_t cred,int flags)107 soo_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
108 int flags)
109 {
110 struct socket *so = fp->f_socket;
111 int error;
112
113 error = (*so->so_receive)(so, NULL, uio, NULL, NULL, NULL);
114
115 return error;
116 }
117
118 /* ARGSUSED */
119 int
soo_write(file_t * fp,off_t * offset,struct uio * uio,kauth_cred_t cred,int flags)120 soo_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred,
121 int flags)
122 {
123 struct socket *so = fp->f_socket;
124 int error;
125
126 error = (*so->so_send)(so, NULL, uio, NULL, NULL, 0, curlwp);
127
128 return error;
129 }
130
131 int
soo_ioctl(file_t * fp,u_long cmd,void * data)132 soo_ioctl(file_t *fp, u_long cmd, void *data)
133 {
134 struct socket *so = fp->f_socket;
135 int error = 0;
136
137 switch (cmd) {
138
139 case FIONBIO:
140 solock(so);
141 if (*(int *)data)
142 so->so_state |= SS_NBIO;
143 else
144 so->so_state &= ~SS_NBIO;
145 sounlock(so);
146 break;
147
148 case FIOASYNC:
149 solock(so);
150 if (*(int *)data) {
151 so->so_rcv.sb_flags |= SB_ASYNC;
152 so->so_snd.sb_flags |= SB_ASYNC;
153 } else {
154 so->so_rcv.sb_flags &= ~SB_ASYNC;
155 so->so_snd.sb_flags &= ~SB_ASYNC;
156 }
157 sounlock(so);
158 break;
159
160 case FIONREAD:
161 *(int *)data = so->so_rcv.sb_cc;
162 break;
163
164 case FIONWRITE:
165 *(int *)data = so->so_snd.sb_cc;
166 break;
167
168 case FIONSPACE:
169 /*
170 * See the comment around sbspace()'s definition
171 * in sys/socketvar.h in face of counts about maximum
172 * to understand the following test. We detect overflow
173 * and return zero.
174 */
175 solock(so);
176 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc)
177 || (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
178 *(int *)data = 0;
179 else
180 *(int *)data = sbspace(&so->so_snd);
181 sounlock(so);
182 break;
183
184 case SIOCSPGRP:
185 case FIOSETOWN:
186 case TIOCSPGRP:
187 error = fsetown(&so->so_pgid, cmd, data);
188 break;
189
190 case SIOCGPGRP:
191 case FIOGETOWN:
192 case TIOCGPGRP:
193 error = fgetown(so->so_pgid, cmd, data);
194 break;
195
196 case SIOCATMARK:
197 *(int *)data = (so->so_state&SS_RCVATMARK) != 0;
198 break;
199
200 case SIOCPEELOFF:
201 solock(so);
202 error = do_sys_peeloff(so, data);
203 sounlock(so);
204 break;
205
206 default:
207 /*
208 * Interface/routing/protocol specific ioctls:
209 * interface and routing ioctls should have a
210 * different entry since a socket's unnecessary
211 */
212 if (IOCGROUP(cmd) == 'i')
213 /*
214 * KERNEL_LOCK will be held later if if_ioctl() of the
215 * interface isn't MP-safe.
216 */
217 error = ifioctl(so, cmd, data, curlwp);
218 else {
219 KERNEL_LOCK(1, NULL);
220 error = (*so->so_proto->pr_usrreqs->pr_ioctl)(so,
221 cmd, data, NULL);
222 KERNEL_UNLOCK_ONE(NULL);
223 }
224 break;
225 }
226
227
228 return error;
229 }
230
231 int
soo_poll(file_t * fp,int events)232 soo_poll(file_t *fp, int events)
233 {
234
235 return sopoll(fp->f_socket, events);
236 }
237
238 int
soo_stat(file_t * fp,struct stat * ub)239 soo_stat(file_t *fp, struct stat *ub)
240 {
241 struct socket *so = fp->f_socket;
242 int error;
243
244 memset(ub, 0, sizeof(*ub));
245 ub->st_mode = S_IFSOCK;
246
247 solock(so);
248 error = (*so->so_proto->pr_usrreqs->pr_stat)(so, ub);
249 sounlock(so);
250
251 return error;
252 }
253
254 /* ARGSUSED */
255 int
soo_close(file_t * fp)256 soo_close(file_t *fp)
257 {
258 int error = 0;
259
260 if (fp->f_socket)
261 error = soclose(fp->f_socket);
262 fp->f_socket = NULL;
263
264 return error;
265 }
266
267 void
soo_restart(file_t * fp)268 soo_restart(file_t *fp)
269 {
270
271 sorestart(fp->f_socket);
272 }
273
274 static int
soo_fpathconf(struct file * fp,int name,register_t * retval)275 soo_fpathconf(struct file *fp, int name, register_t *retval)
276 {
277
278 switch (name) {
279 case _PC_PIPE_BUF:
280 *retval = PIPE_BUF;
281 return 0;
282 default:
283 return SET_ERROR(EINVAL);
284 }
285 }
286
287 static int
soo_posix_fadvise(struct file * fp,off_t offset,off_t len,int advice)288 soo_posix_fadvise(struct file *fp, off_t offset, off_t len, int advice)
289 {
290
291 return SET_ERROR(ESPIPE);
292 }
293