2 * Copyright (c) 1982, 1986, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
38 #include <sys/filedesc.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>
50 #include <sys/ucred.h>
53 #include <net/route.h>
56 #include <security/mac/mac_framework.h>
58 struct fileops socketops = {
60 .fo_write = soo_write,
61 .fo_truncate = soo_truncate,
62 .fo_ioctl = soo_ioctl,
64 .fo_kqfilter = soo_kqfilter,
66 .fo_close = soo_close,
67 .fo_chmod = invfo_chmod,
68 .fo_chown = invfo_chown,
69 .fo_flags = DFLAG_PASSABLE
74 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
75 int flags, struct thread *td)
77 struct socket *so = fp->f_data;
81 error = mac_socket_check_receive(active_cred, so);
85 error = soreceive(so, 0, uio, 0, 0, 0);
91 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
92 int flags, struct thread *td)
94 struct socket *so = fp->f_data;
98 error = mac_socket_check_send(active_cred, so);
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);
112 soo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
120 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
123 struct socket *so = fp->f_data;
130 so->so_state |= SS_NBIO;
132 so->so_state &= ~SS_NBIO;
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
145 so->so_state |= SS_ASYNC;
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);
155 so->so_state &= ~SS_ASYNC;
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);
168 *(int *)data = so->so_rcv.sb_cc;
173 *(int *)data = so->so_snd.sb_cc;
177 if ((so->so_snd.sb_hiwat < so->so_snd.sb_cc) ||
178 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt))
181 *(int *)data = sbspace(&so->so_snd);
185 error = fsetown(*(int *)data, &so->so_sigio);
189 *(int *)data = fgetown(&so->so_sigio);
193 error = fsetown(-(*(int *)data), &so->so_sigio);
197 *(int *)data = -fgetown(&so->so_sigio);
202 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
206 * Interface/routing/protocol specific ioctls: interface and
207 * routing ioctls should have a different entry since a
208 * socket is unnecessary.
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);
217 CURVNET_SET(so->so_vnet);
218 error = ((*so->so_proto->pr_usrreqs->pru_control)
219 (so, cmd, data, 0, td));
228 soo_poll(struct file *fp, int events, struct ucred *active_cred,
231 struct socket *so = fp->f_data;
235 error = mac_socket_check_poll(active_cred, so);
239 return (sopoll(so, events, fp->f_cred, td));
243 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred,
246 struct socket *so = fp->f_data;
251 bzero((caddr_t)ub, sizeof (*ub));
252 ub->st_mode = S_IFSOCK;
254 error = mac_socket_check_stat(active_cred, so);
259 * If SBS_CANTRCVMORE is set, but there's still data left in the
260 * receive buffer, the socket is still readable.
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);
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);
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
284 soo_close(struct file *fp, struct thread *td)
290 fp->f_ops = &badfileops;