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29 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
40 #include <sys/filedesc.h>
42 #include <sys/protosw.h>
43 #include <sys/sigio.h>
44 #include <sys/signal.h>
45 #include <sys/signalvar.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/filio.h> /* XXX */
49 #include <sys/sockio.h>
52 #include <sys/ucred.h>
55 #include <net/route.h>
57 #include <security/mac/mac_framework.h>
59 struct fileops socketops = {
61 .fo_write = soo_write,
62 .fo_truncate = soo_truncate,
63 .fo_ioctl = soo_ioctl,
65 .fo_kqfilter = soo_kqfilter,
67 .fo_close = soo_close,
68 .fo_flags = DFLAG_PASSABLE
73 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
74 int flags, struct thread *td)
76 struct socket *so = fp->f_data;
81 error = mac_socket_check_receive(active_cred, so);
86 return (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;
99 error = mac_socket_check_send(active_cred, so);
104 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td);
105 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) {
106 PROC_LOCK(uio->uio_td->td_proc);
107 psignal(uio->uio_td->td_proc, SIGPIPE);
108 PROC_UNLOCK(uio->uio_td->td_proc);
114 soo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
122 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
125 struct socket *so = fp->f_data;
132 so->so_state |= SS_NBIO;
134 so->so_state &= ~SS_NBIO;
140 * XXXRW: This code separately acquires SOCK_LOCK(so) and
141 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same
142 * mutex to avoid introducing the assumption that they are
147 so->so_state |= SS_ASYNC;
149 SOCKBUF_LOCK(&so->so_rcv);
150 so->so_rcv.sb_flags |= SB_ASYNC;
151 SOCKBUF_UNLOCK(&so->so_rcv);
152 SOCKBUF_LOCK(&so->so_snd);
153 so->so_snd.sb_flags |= SB_ASYNC;
154 SOCKBUF_UNLOCK(&so->so_snd);
157 so->so_state &= ~SS_ASYNC;
159 SOCKBUF_LOCK(&so->so_rcv);
160 so->so_rcv.sb_flags &= ~SB_ASYNC;
161 SOCKBUF_UNLOCK(&so->so_rcv);
162 SOCKBUF_LOCK(&so->so_snd);
163 so->so_snd.sb_flags &= ~SB_ASYNC;
164 SOCKBUF_UNLOCK(&so->so_snd);
170 *(int *)data = so->so_rcv.sb_cc;
174 error = fsetown(*(int *)data, &so->so_sigio);
178 *(int *)data = fgetown(&so->so_sigio);
182 error = fsetown(-(*(int *)data), &so->so_sigio);
186 *(int *)data = -fgetown(&so->so_sigio);
191 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
195 * Interface/routing/protocol specific ioctls: interface and
196 * routing ioctls should have a different entry since a
197 * socket is unnecessary.
199 if (IOCGROUP(cmd) == 'i')
200 error = ifioctl(so, cmd, data, td);
201 else if (IOCGROUP(cmd) == 'r')
202 error = rtioctl_fib(cmd, data, so->so_fibnum);
204 error = ((*so->so_proto->pr_usrreqs->pru_control)
205 (so, cmd, data, 0, td));
212 soo_poll(struct file *fp, int events, struct ucred *active_cred,
215 struct socket *so = fp->f_data;
220 error = mac_socket_check_poll(active_cred, so);
225 return (sopoll(so, events, fp->f_cred, td));
229 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred,
232 struct socket *so = fp->f_data;
237 bzero((caddr_t)ub, sizeof (*ub));
238 ub->st_mode = S_IFSOCK;
241 error = mac_socket_check_stat(active_cred, so);
247 * If SBS_CANTRCVMORE is set, but there's still data left in the
248 * receive buffer, the socket is still readable.
250 * XXXRW: perhaps should lock socket buffer so st_size result is
254 if ((so->so_rcv.sb_state & SBS_CANTRCVMORE) == 0 ||
255 so->so_rcv.sb_cc != 0)
256 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
257 if ((so->so_snd.sb_state & SBS_CANTSENDMORE) == 0)
258 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
259 ub->st_size = so->so_rcv.sb_cc - so->so_rcv.sb_ctl;
260 ub->st_uid = so->so_cred->cr_uid;
261 ub->st_gid = so->so_cred->cr_gid;
262 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub);
266 * API socket close on file pointer. We call soclose() to close the socket
267 * (including initiating closing protocols). soclose() will sorele() the
268 * file reference but the actual socket will not go away until the socket's
273 soo_close(struct file *fp, struct thread *td)
279 fp->f_ops = &badfileops;