FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_socket.c
1 /*-
2 * Copyright (c) 1982, 1986, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/9.0/sys/kern/sys_socket.c 224914 2011-08-16 20:07:47Z kib $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/file.h>
38 #include <sys/filedesc.h>
39 #include <sys/proc.h>
40 #include <sys/protosw.h>
41 #include <sys/sigio.h>
42 #include <sys/signal.h>
43 #include <sys/signalvar.h>
44 #include <sys/socket.h>
45 #include <sys/socketvar.h>
46 #include <sys/filio.h> /* XXX */
47 #include <sys/sockio.h>
48 #include <sys/stat.h>
49 #include <sys/uio.h>
50 #include <sys/ucred.h>
51
52 #include <net/if.h>
53 #include <net/route.h>
54 #include <net/vnet.h>
55
56 #include <security/mac/mac_framework.h>
57
58 struct fileops socketops = {
59 .fo_read = soo_read,
60 .fo_write = soo_write,
61 .fo_truncate = soo_truncate,
62 .fo_ioctl = soo_ioctl,
63 .fo_poll = soo_poll,
64 .fo_kqfilter = soo_kqfilter,
65 .fo_stat = soo_stat,
66 .fo_close = soo_close,
67 .fo_chmod = invfo_chmod,
68 .fo_chown = invfo_chown,
69 .fo_flags = DFLAG_PASSABLE
70 };
71
72 /* ARGSUSED */
73 int
74 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
75 int flags, struct thread *td)
76 {
77 struct socket *so = fp->f_data;
78 int error;
79
80 #ifdef MAC
81 error = mac_socket_check_receive(active_cred, so);
82 if (error)
83 return (error);
84 #endif
85 error = soreceive(so, 0, uio, 0, 0, 0);
86 return (error);
87 }
88
89 /* ARGSUSED */
90 int
91 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
92 int flags, struct thread *td)
93 {
94 struct socket *so = fp->f_data;
95 int error;
96
97 #ifdef MAC
98 error = mac_socket_check_send(active_cred, so);
99 if (error)
100 return (error);
101 #endif
102 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td);
103 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) {
104 PROC_LOCK(uio->uio_td->td_proc);
105 tdsignal(uio->uio_td, SIGPIPE);
106 PROC_UNLOCK(uio->uio_td->td_proc);
107 }
108 return (error);
109 }
110
111 int
112 soo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
113 struct thread *td)
114 {
115
116 return (EINVAL);
117 }
118
119 int
120 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
121 struct thread *td)
122 {
123 struct socket *so = fp->f_data;
124 int error = 0;
125
126 switch (cmd) {
127 case FIONBIO:
128 SOCK_LOCK(so);
129 if (*(int *)data)
130 so->so_state |= SS_NBIO;
131 else
132 so->so_state &= ~SS_NBIO;
133 SOCK_UNLOCK(so);
134 break;
135
136 case FIOASYNC:
137 /*
138 * XXXRW: This code separately acquires SOCK_LOCK(so) and
139 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same
140 * mutex to avoid introducing the assumption that they are
141 * the same.
142 */
143 if (*(int *)data) {
144 SOCK_LOCK(so);
145 so->so_state |= SS_ASYNC;
146 SOCK_UNLOCK(so);
147 SOCKBUF_LOCK(&so->so_rcv);
148 so->so_rcv.sb_flags |= SB_ASYNC;
149 SOCKBUF_UNLOCK(&so->so_rcv);
150 SOCKBUF_LOCK(&so->so_snd);
151 so->so_snd.sb_flags |= SB_ASYNC;
152 SOCKBUF_UNLOCK(&so->so_snd);
153 } else {
154 SOCK_LOCK(so);
155 so->so_state &= ~SS_ASYNC;
156 SOCK_UNLOCK(so);
157 SOCKBUF_LOCK(&so->so_rcv);
158 so->so_rcv.sb_flags &= ~SB_ASYNC;
159 SOCKBUF_UNLOCK(&so->so_rcv);
160 SOCKBUF_LOCK(&so->so_snd);
161 so->so_snd.sb_flags &= ~SB_ASYNC;
162 SOCKBUF_UNLOCK(&so->so_snd);
163 }
164 break;
165
166 case FIONREAD:
167 /* Unlocked read. */
168 *(int *)data = so->so_rcv.sb_cc;
169 break;
170
171 case FIONWRITE:
172 /* Unlocked read. */
173 *(int *)data = so->so_snd.sb_cc;
174 break;
175
176 case FIONSPACE:
177 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) ||
178 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
179 *(int *)data = 0;
180 else
181 *(int *)data = sbspace(&so->so_snd);
182 break;
183
184 case FIOSETOWN:
185 error = fsetown(*(int *)data, &so->so_sigio);
186 break;
187
188 case FIOGETOWN:
189 *(int *)data = fgetown(&so->so_sigio);
190 break;
191
192 case SIOCSPGRP:
193 error = fsetown(-(*(int *)data), &so->so_sigio);
194 break;
195
196 case SIOCGPGRP:
197 *(int *)data = -fgetown(&so->so_sigio);
198 break;
199
200 case SIOCATMARK:
201 /* Unlocked read. */
202 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
203 break;
204 default:
205 /*
206 * Interface/routing/protocol specific ioctls: interface and
207 * routing ioctls should have a different entry since a
208 * socket is unnecessary.
209 */
210 if (IOCGROUP(cmd) == 'i')
211 error = ifioctl(so, cmd, data, td);
212 else if (IOCGROUP(cmd) == 'r') {
213 CURVNET_SET(so->so_vnet);
214 error = rtioctl_fib(cmd, data, so->so_fibnum);
215 CURVNET_RESTORE();
216 } else {
217 CURVNET_SET(so->so_vnet);
218 error = ((*so->so_proto->pr_usrreqs->pru_control)
219 (so, cmd, data, 0, td));
220 CURVNET_RESTORE();
221 }
222 break;
223 }
224 return (error);
225 }
226
227 int
228 soo_poll(struct file *fp, int events, struct ucred *active_cred,
229 struct thread *td)
230 {
231 struct socket *so = fp->f_data;
232 #ifdef MAC
233 int error;
234
235 error = mac_socket_check_poll(active_cred, so);
236 if (error)
237 return (error);
238 #endif
239 return (sopoll(so, events, fp->f_cred, td));
240 }
241
242 int
243 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred,
244 struct thread *td)
245 {
246 struct socket *so = fp->f_data;
247 #ifdef MAC
248 int error;
249 #endif
250
251 bzero((caddr_t)ub, sizeof (*ub));
252 ub->st_mode = S_IFSOCK;
253 #ifdef MAC
254 error = mac_socket_check_stat(active_cred, so);
255 if (error)
256 return (error);
257 #endif
258 /*
259 * If SBS_CANTRCVMORE is set, but there's still data left in the
260 * receive buffer, the socket is still readable.
261 */
262 SOCKBUF_LOCK(&so->so_rcv);
263 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
264 so->so_rcv.sb_cc != 0)
265 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
266 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
267 SOCKBUF_UNLOCK(&so->so_rcv);
268 /* Unlocked read. */
269 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
270 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
271 ub->st_uid = so->so_cred->cr_uid;
272 ub->st_gid = so->so_cred->cr_gid;
273 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
274 }
275
276 /*
277 * API socket close on file pointer. We call soclose() to close the socket
278 * (including initiating closing protocols). soclose() will sorele() the
279 * file reference but the actual socket will not go away until the socket's
280 * ref count hits 0.
281 */
282 /* ARGSUSED */
283 int
284 soo_close(struct file *fp, struct thread *td)
285 {
286 int error = 0;
287 struct socket *so;
288
289 so = fp->f_data;
290 fp->f_ops = &badfileops;
291 fp->f_data = NULL;
292
293 if (so)
294 error = soclose(so);
295 return (error);
296 }
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