1/*
2 * Copyright (c) 1982, 1986, 1989, 1991, 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
| 1/*
2 * Copyright (c) 1982, 1986, 1989, 1991, 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
|
34 * $FreeBSD: head/sys/kern/uipc_usrreq.c 81907 2001-08-19 04:30:13Z julian $
| 34 * $FreeBSD: head/sys/kern/uipc_usrreq.c 83366 2001-09-12 08:38:13Z julian $
|
35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/fcntl.h>
41#include <sys/domain.h>
42#include <sys/filedesc.h>
43#include <sys/lock.h>
44#include <sys/malloc.h> /* XXX must be before <sys/file.h> */
45#include <sys/file.h>
46#include <sys/mutex.h>
47#include <sys/mbuf.h>
48#include <sys/namei.h>
49#include <sys/proc.h>
50#include <sys/protosw.h>
51#include <sys/socket.h>
52#include <sys/socketvar.h>
53#include <sys/resourcevar.h>
54#include <sys/stat.h>
55#include <sys/sysctl.h>
56#include <sys/un.h>
57#include <sys/unpcb.h>
58#include <sys/vnode.h>
59#include <sys/jail.h>
60
61#include <vm/vm_zone.h>
62
63static struct vm_zone *unp_zone;
64static unp_gen_t unp_gencnt;
65static u_int unp_count;
66
67static struct unp_head unp_shead, unp_dhead;
68
69/*
70 * Unix communications domain.
71 *
72 * TODO:
73 * SEQPACKET, RDM
74 * rethink name space problems
75 * need a proper out-of-band
76 * lock pushdown
77 */
78static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
79static ino_t unp_ino; /* prototype for fake inode numbers */
80
81static int unp_attach __P((struct socket *));
82static void unp_detach __P((struct unpcb *));
| 35 */
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/fcntl.h>
41#include <sys/domain.h>
42#include <sys/filedesc.h>
43#include <sys/lock.h>
44#include <sys/malloc.h> /* XXX must be before <sys/file.h> */
45#include <sys/file.h>
46#include <sys/mutex.h>
47#include <sys/mbuf.h>
48#include <sys/namei.h>
49#include <sys/proc.h>
50#include <sys/protosw.h>
51#include <sys/socket.h>
52#include <sys/socketvar.h>
53#include <sys/resourcevar.h>
54#include <sys/stat.h>
55#include <sys/sysctl.h>
56#include <sys/un.h>
57#include <sys/unpcb.h>
58#include <sys/vnode.h>
59#include <sys/jail.h>
60
61#include <vm/vm_zone.h>
62
63static struct vm_zone *unp_zone;
64static unp_gen_t unp_gencnt;
65static u_int unp_count;
66
67static struct unp_head unp_shead, unp_dhead;
68
69/*
70 * Unix communications domain.
71 *
72 * TODO:
73 * SEQPACKET, RDM
74 * rethink name space problems
75 * need a proper out-of-band
76 * lock pushdown
77 */
78static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
79static ino_t unp_ino; /* prototype for fake inode numbers */
80
81static int unp_attach __P((struct socket *));
82static void unp_detach __P((struct unpcb *));
|
83static int unp_bind __P((struct unpcb *,struct sockaddr *, struct proc *));
| 83static int unp_bind __P((struct unpcb *,struct sockaddr *, struct thread *));
|
84static int unp_connect __P((struct socket *,struct sockaddr *,
| 84static int unp_connect __P((struct socket *,struct sockaddr *,
|
85 struct proc *));
| 85 struct thread *));
|
86static void unp_disconnect __P((struct unpcb *));
87static void unp_shutdown __P((struct unpcb *));
88static void unp_drop __P((struct unpcb *, int));
89static void unp_gc __P((void));
90static void unp_scan __P((struct mbuf *, void (*)(struct file *)));
91static void unp_mark __P((struct file *));
92static void unp_discard __P((struct file *));
| 86static void unp_disconnect __P((struct unpcb *));
87static void unp_shutdown __P((struct unpcb *));
88static void unp_drop __P((struct unpcb *, int));
89static void unp_gc __P((void));
90static void unp_scan __P((struct mbuf *, void (*)(struct file *)));
91static void unp_mark __P((struct file *));
92static void unp_discard __P((struct file *));
|
93static int unp_internalize __P((struct mbuf *, struct proc *));
| 93static int unp_internalize __P((struct mbuf *, struct thread *));
|
94static int unp_listen __P((struct unpcb *, struct proc *));
95
96static int
97uipc_abort(struct socket *so)
98{
99 struct unpcb *unp = sotounpcb(so);
100
101 if (unp == 0)
102 return EINVAL;
103 unp_drop(unp, ECONNABORTED);
104 return 0;
105}
106
107static int
108uipc_accept(struct socket *so, struct sockaddr **nam)
109{
110 struct unpcb *unp = sotounpcb(so);
111
112 if (unp == 0)
113 return EINVAL;
114
115 /*
116 * Pass back name of connected socket,
117 * if it was bound and we are still connected
118 * (our peer may have closed already!).
119 */
120 if (unp->unp_conn && unp->unp_conn->unp_addr) {
121 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
122 1);
123 } else {
124 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
125 }
126 return 0;
127}
128
129static int
| 94static int unp_listen __P((struct unpcb *, struct proc *));
95
96static int
97uipc_abort(struct socket *so)
98{
99 struct unpcb *unp = sotounpcb(so);
100
101 if (unp == 0)
102 return EINVAL;
103 unp_drop(unp, ECONNABORTED);
104 return 0;
105}
106
107static int
108uipc_accept(struct socket *so, struct sockaddr **nam)
109{
110 struct unpcb *unp = sotounpcb(so);
111
112 if (unp == 0)
113 return EINVAL;
114
115 /*
116 * Pass back name of connected socket,
117 * if it was bound and we are still connected
118 * (our peer may have closed already!).
119 */
120 if (unp->unp_conn && unp->unp_conn->unp_addr) {
121 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
122 1);
123 } else {
124 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
125 }
126 return 0;
127}
128
129static int
|
130uipc_attach(struct socket *so, int proto, struct proc *p)
| 130uipc_attach(struct socket *so, int proto, struct thread *td)
|
131{
132 struct unpcb *unp = sotounpcb(so);
133
134 if (unp != 0)
135 return EISCONN;
136 return unp_attach(so);
137}
138
139static int
| 131{
132 struct unpcb *unp = sotounpcb(so);
133
134 if (unp != 0)
135 return EISCONN;
136 return unp_attach(so);
137}
138
139static int
|
140uipc_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
| 140uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
141{
142 struct unpcb *unp = sotounpcb(so);
143
144 if (unp == 0)
145 return EINVAL;
146
| 141{
142 struct unpcb *unp = sotounpcb(so);
143
144 if (unp == 0)
145 return EINVAL;
146
|
147 return unp_bind(unp, nam, p);
| 147 return unp_bind(unp, nam, td);
|
148}
149
150static int
| 148}
149
150static int
|
151uipc_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
| 151uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
152{
153 struct unpcb *unp = sotounpcb(so);
154
155 if (unp == 0)
156 return EINVAL;
| 152{
153 struct unpcb *unp = sotounpcb(so);
154
155 if (unp == 0)
156 return EINVAL;
|
157 return unp_connect(so, nam, curproc);
| 157 return unp_connect(so, nam, curthread);
|
158}
159
160static int
161uipc_connect2(struct socket *so1, struct socket *so2)
162{
163 struct unpcb *unp = sotounpcb(so1);
164
165 if (unp == 0)
166 return EINVAL;
167
168 return unp_connect2(so1, so2);
169}
170
171/* control is EOPNOTSUPP */
172
173static int
174uipc_detach(struct socket *so)
175{
176 struct unpcb *unp = sotounpcb(so);
177
178 if (unp == 0)
179 return EINVAL;
180
181 unp_detach(unp);
182 return 0;
183}
184
185static int
186uipc_disconnect(struct socket *so)
187{
188 struct unpcb *unp = sotounpcb(so);
189
190 if (unp == 0)
191 return EINVAL;
192 unp_disconnect(unp);
193 return 0;
194}
195
196static int
| 158}
159
160static int
161uipc_connect2(struct socket *so1, struct socket *so2)
162{
163 struct unpcb *unp = sotounpcb(so1);
164
165 if (unp == 0)
166 return EINVAL;
167
168 return unp_connect2(so1, so2);
169}
170
171/* control is EOPNOTSUPP */
172
173static int
174uipc_detach(struct socket *so)
175{
176 struct unpcb *unp = sotounpcb(so);
177
178 if (unp == 0)
179 return EINVAL;
180
181 unp_detach(unp);
182 return 0;
183}
184
185static int
186uipc_disconnect(struct socket *so)
187{
188 struct unpcb *unp = sotounpcb(so);
189
190 if (unp == 0)
191 return EINVAL;
192 unp_disconnect(unp);
193 return 0;
194}
195
196static int
|
197uipc_listen(struct socket *so, struct proc *p)
| 197uipc_listen(struct socket *so, struct thread *td)
|
198{
199 struct unpcb *unp = sotounpcb(so);
200
201 if (unp == 0 || unp->unp_vnode == 0)
202 return EINVAL;
| 198{
199 struct unpcb *unp = sotounpcb(so);
200
201 if (unp == 0 || unp->unp_vnode == 0)
202 return EINVAL;
|
203 return unp_listen(unp, p);
| 203 return unp_listen(unp, td->td_proc);
|
204}
205
206static int
207uipc_peeraddr(struct socket *so, struct sockaddr **nam)
208{
209 struct unpcb *unp = sotounpcb(so);
210
211 if (unp == 0)
212 return EINVAL;
213 if (unp->unp_conn && unp->unp_conn->unp_addr)
214 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
215 1);
216 return 0;
217}
218
219static int
220uipc_rcvd(struct socket *so, int flags)
221{
222 struct unpcb *unp = sotounpcb(so);
223 struct socket *so2;
224 u_long newhiwat;
225
226 if (unp == 0)
227 return EINVAL;
228 switch (so->so_type) {
229 case SOCK_DGRAM:
230 panic("uipc_rcvd DGRAM?");
231 /*NOTREACHED*/
232
233 case SOCK_STREAM:
234 if (unp->unp_conn == 0)
235 break;
236 so2 = unp->unp_conn->unp_socket;
237 /*
238 * Adjust backpressure on sender
239 * and wakeup any waiting to write.
240 */
241 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
242 unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
243 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
244 so->so_rcv.sb_cc;
245 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
246 newhiwat, RLIM_INFINITY);
247 unp->unp_cc = so->so_rcv.sb_cc;
248 sowwakeup(so2);
249 break;
250
251 default:
252 panic("uipc_rcvd unknown socktype");
253 }
254 return 0;
255}
256
257/* pru_rcvoob is EOPNOTSUPP */
258
259static int
260uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
| 204}
205
206static int
207uipc_peeraddr(struct socket *so, struct sockaddr **nam)
208{
209 struct unpcb *unp = sotounpcb(so);
210
211 if (unp == 0)
212 return EINVAL;
213 if (unp->unp_conn && unp->unp_conn->unp_addr)
214 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
215 1);
216 return 0;
217}
218
219static int
220uipc_rcvd(struct socket *so, int flags)
221{
222 struct unpcb *unp = sotounpcb(so);
223 struct socket *so2;
224 u_long newhiwat;
225
226 if (unp == 0)
227 return EINVAL;
228 switch (so->so_type) {
229 case SOCK_DGRAM:
230 panic("uipc_rcvd DGRAM?");
231 /*NOTREACHED*/
232
233 case SOCK_STREAM:
234 if (unp->unp_conn == 0)
235 break;
236 so2 = unp->unp_conn->unp_socket;
237 /*
238 * Adjust backpressure on sender
239 * and wakeup any waiting to write.
240 */
241 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
242 unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
243 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
244 so->so_rcv.sb_cc;
245 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
246 newhiwat, RLIM_INFINITY);
247 unp->unp_cc = so->so_rcv.sb_cc;
248 sowwakeup(so2);
249 break;
250
251 default:
252 panic("uipc_rcvd unknown socktype");
253 }
254 return 0;
255}
256
257/* pru_rcvoob is EOPNOTSUPP */
258
259static int
260uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
261 struct mbuf *control, struct proc *p)
| 261 struct mbuf *control, struct thread *td)
|
262{
263 int error = 0;
264 struct unpcb *unp = sotounpcb(so);
265 struct socket *so2;
266 u_long newhiwat;
267
268 if (unp == 0) {
269 error = EINVAL;
270 goto release;
271 }
272 if (flags & PRUS_OOB) {
273 error = EOPNOTSUPP;
274 goto release;
275 }
276
| 262{
263 int error = 0;
264 struct unpcb *unp = sotounpcb(so);
265 struct socket *so2;
266 u_long newhiwat;
267
268 if (unp == 0) {
269 error = EINVAL;
270 goto release;
271 }
272 if (flags & PRUS_OOB) {
273 error = EOPNOTSUPP;
274 goto release;
275 }
276
|
277 if (control && (error = unp_internalize(control, p)))
| 277 if (control && (error = unp_internalize(control, td)))
|
278 goto release;
279
280 switch (so->so_type) {
281 case SOCK_DGRAM:
282 {
283 struct sockaddr *from;
284
285 if (nam) {
286 if (unp->unp_conn) {
287 error = EISCONN;
288 break;
289 }
| 278 goto release;
279
280 switch (so->so_type) {
281 case SOCK_DGRAM:
282 {
283 struct sockaddr *from;
284
285 if (nam) {
286 if (unp->unp_conn) {
287 error = EISCONN;
288 break;
289 }
|
290 error = unp_connect(so, nam, p);
| 290 error = unp_connect(so, nam, td);
|
291 if (error)
292 break;
293 } else {
294 if (unp->unp_conn == 0) {
295 error = ENOTCONN;
296 break;
297 }
298 }
299 so2 = unp->unp_conn->unp_socket;
300 if (unp->unp_addr)
301 from = (struct sockaddr *)unp->unp_addr;
302 else
303 from = &sun_noname;
304 if (sbappendaddr(&so2->so_rcv, from, m, control)) {
305 sorwakeup(so2);
306 m = 0;
307 control = 0;
308 } else
309 error = ENOBUFS;
310 if (nam)
311 unp_disconnect(unp);
312 break;
313 }
314
315 case SOCK_STREAM:
316 /* Connect if not connected yet. */
317 /*
318 * Note: A better implementation would complain
319 * if not equal to the peer's address.
320 */
321 if ((so->so_state & SS_ISCONNECTED) == 0) {
322 if (nam) {
| 291 if (error)
292 break;
293 } else {
294 if (unp->unp_conn == 0) {
295 error = ENOTCONN;
296 break;
297 }
298 }
299 so2 = unp->unp_conn->unp_socket;
300 if (unp->unp_addr)
301 from = (struct sockaddr *)unp->unp_addr;
302 else
303 from = &sun_noname;
304 if (sbappendaddr(&so2->so_rcv, from, m, control)) {
305 sorwakeup(so2);
306 m = 0;
307 control = 0;
308 } else
309 error = ENOBUFS;
310 if (nam)
311 unp_disconnect(unp);
312 break;
313 }
314
315 case SOCK_STREAM:
316 /* Connect if not connected yet. */
317 /*
318 * Note: A better implementation would complain
319 * if not equal to the peer's address.
320 */
321 if ((so->so_state & SS_ISCONNECTED) == 0) {
322 if (nam) {
|
323 error = unp_connect(so, nam, p);
| 323 error = unp_connect(so, nam, td);
|
324 if (error)
325 break; /* XXX */
326 } else {
327 error = ENOTCONN;
328 break;
329 }
330 }
331
332 if (so->so_state & SS_CANTSENDMORE) {
333 error = EPIPE;
334 break;
335 }
336 if (unp->unp_conn == 0)
337 panic("uipc_send connected but no connection?");
338 so2 = unp->unp_conn->unp_socket;
339 /*
340 * Send to paired receive port, and then reduce
341 * send buffer hiwater marks to maintain backpressure.
342 * Wake up readers.
343 */
344 if (control) {
345 if (sbappendcontrol(&so2->so_rcv, m, control))
346 control = 0;
347 } else
348 sbappend(&so2->so_rcv, m);
349 so->so_snd.sb_mbmax -=
350 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
351 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
352 newhiwat = so->so_snd.sb_hiwat -
353 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
354 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
355 newhiwat, RLIM_INFINITY);
356 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
357 sorwakeup(so2);
358 m = 0;
359 break;
360
361 default:
362 panic("uipc_send unknown socktype");
363 }
364
365 /*
366 * SEND_EOF is equivalent to a SEND followed by
367 * a SHUTDOWN.
368 */
369 if (flags & PRUS_EOF) {
370 socantsendmore(so);
371 unp_shutdown(unp);
372 }
373
374 if (control && error != 0)
375 unp_dispose(control);
376
377release:
378 if (control)
379 m_freem(control);
380 if (m)
381 m_freem(m);
382 return error;
383}
384
385static int
386uipc_sense(struct socket *so, struct stat *sb)
387{
388 struct unpcb *unp = sotounpcb(so);
389 struct socket *so2;
390
391 if (unp == 0)
392 return EINVAL;
393 sb->st_blksize = so->so_snd.sb_hiwat;
394 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
395 so2 = unp->unp_conn->unp_socket;
396 sb->st_blksize += so2->so_rcv.sb_cc;
397 }
398 sb->st_dev = NOUDEV;
399 if (unp->unp_ino == 0)
400 unp->unp_ino = unp_ino++;
401 sb->st_ino = unp->unp_ino;
402 return (0);
403}
404
405static int
406uipc_shutdown(struct socket *so)
407{
408 struct unpcb *unp = sotounpcb(so);
409
410 if (unp == 0)
411 return EINVAL;
412 socantsendmore(so);
413 unp_shutdown(unp);
414 return 0;
415}
416
417static int
418uipc_sockaddr(struct socket *so, struct sockaddr **nam)
419{
420 struct unpcb *unp = sotounpcb(so);
421
422 if (unp == 0)
423 return EINVAL;
424 if (unp->unp_addr)
425 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
426 else
427 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
428 return 0;
429}
430
431struct pr_usrreqs uipc_usrreqs = {
432 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
433 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
434 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
435 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
436 sosend, soreceive, sopoll
437};
438
439int
440uipc_ctloutput(so, sopt)
441 struct socket *so;
442 struct sockopt *sopt;
443{
444 struct unpcb *unp = sotounpcb(so);
445 int error;
446
447 switch (sopt->sopt_dir) {
448 case SOPT_GET:
449 switch (sopt->sopt_name) {
450 case LOCAL_PEERCRED:
451 if (unp->unp_flags & UNP_HAVEPC)
452 error = sooptcopyout(sopt, &unp->unp_peercred,
453 sizeof(unp->unp_peercred));
454 else {
455 if (so->so_type == SOCK_STREAM)
456 error = ENOTCONN;
457 else
458 error = EINVAL;
459 }
460 break;
461 default:
462 error = EOPNOTSUPP;
463 break;
464 }
465 break;
466 case SOPT_SET:
467 default:
468 error = EOPNOTSUPP;
469 break;
470 }
471 return (error);
472}
473
474/*
475 * Both send and receive buffers are allocated PIPSIZ bytes of buffering
476 * for stream sockets, although the total for sender and receiver is
477 * actually only PIPSIZ.
478 * Datagram sockets really use the sendspace as the maximum datagram size,
479 * and don't really want to reserve the sendspace. Their recvspace should
480 * be large enough for at least one max-size datagram plus address.
481 */
482#ifndef PIPSIZ
483#define PIPSIZ 8192
484#endif
485static u_long unpst_sendspace = PIPSIZ;
486static u_long unpst_recvspace = PIPSIZ;
487static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
488static u_long unpdg_recvspace = 4*1024;
489
490static int unp_rights; /* file descriptors in flight */
491
492SYSCTL_DECL(_net_local_stream);
493SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
494 &unpst_sendspace, 0, "");
495SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
496 &unpst_recvspace, 0, "");
497SYSCTL_DECL(_net_local_dgram);
498SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
499 &unpdg_sendspace, 0, "");
500SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
501 &unpdg_recvspace, 0, "");
502SYSCTL_DECL(_net_local);
503SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
504
505static int
506unp_attach(so)
507 struct socket *so;
508{
509 register struct unpcb *unp;
510 int error;
511
512 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
513 switch (so->so_type) {
514
515 case SOCK_STREAM:
516 error = soreserve(so, unpst_sendspace, unpst_recvspace);
517 break;
518
519 case SOCK_DGRAM:
520 error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
521 break;
522
523 default:
524 panic("unp_attach");
525 }
526 if (error)
527 return (error);
528 }
529 unp = zalloc(unp_zone);
530 if (unp == NULL)
531 return (ENOBUFS);
532 bzero(unp, sizeof *unp);
533 unp->unp_gencnt = ++unp_gencnt;
534 unp_count++;
535 LIST_INIT(&unp->unp_refs);
536 unp->unp_socket = so;
| 324 if (error)
325 break; /* XXX */
326 } else {
327 error = ENOTCONN;
328 break;
329 }
330 }
331
332 if (so->so_state & SS_CANTSENDMORE) {
333 error = EPIPE;
334 break;
335 }
336 if (unp->unp_conn == 0)
337 panic("uipc_send connected but no connection?");
338 so2 = unp->unp_conn->unp_socket;
339 /*
340 * Send to paired receive port, and then reduce
341 * send buffer hiwater marks to maintain backpressure.
342 * Wake up readers.
343 */
344 if (control) {
345 if (sbappendcontrol(&so2->so_rcv, m, control))
346 control = 0;
347 } else
348 sbappend(&so2->so_rcv, m);
349 so->so_snd.sb_mbmax -=
350 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
351 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
352 newhiwat = so->so_snd.sb_hiwat -
353 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
354 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
355 newhiwat, RLIM_INFINITY);
356 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
357 sorwakeup(so2);
358 m = 0;
359 break;
360
361 default:
362 panic("uipc_send unknown socktype");
363 }
364
365 /*
366 * SEND_EOF is equivalent to a SEND followed by
367 * a SHUTDOWN.
368 */
369 if (flags & PRUS_EOF) {
370 socantsendmore(so);
371 unp_shutdown(unp);
372 }
373
374 if (control && error != 0)
375 unp_dispose(control);
376
377release:
378 if (control)
379 m_freem(control);
380 if (m)
381 m_freem(m);
382 return error;
383}
384
385static int
386uipc_sense(struct socket *so, struct stat *sb)
387{
388 struct unpcb *unp = sotounpcb(so);
389 struct socket *so2;
390
391 if (unp == 0)
392 return EINVAL;
393 sb->st_blksize = so->so_snd.sb_hiwat;
394 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
395 so2 = unp->unp_conn->unp_socket;
396 sb->st_blksize += so2->so_rcv.sb_cc;
397 }
398 sb->st_dev = NOUDEV;
399 if (unp->unp_ino == 0)
400 unp->unp_ino = unp_ino++;
401 sb->st_ino = unp->unp_ino;
402 return (0);
403}
404
405static int
406uipc_shutdown(struct socket *so)
407{
408 struct unpcb *unp = sotounpcb(so);
409
410 if (unp == 0)
411 return EINVAL;
412 socantsendmore(so);
413 unp_shutdown(unp);
414 return 0;
415}
416
417static int
418uipc_sockaddr(struct socket *so, struct sockaddr **nam)
419{
420 struct unpcb *unp = sotounpcb(so);
421
422 if (unp == 0)
423 return EINVAL;
424 if (unp->unp_addr)
425 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
426 else
427 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
428 return 0;
429}
430
431struct pr_usrreqs uipc_usrreqs = {
432 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
433 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
434 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
435 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
436 sosend, soreceive, sopoll
437};
438
439int
440uipc_ctloutput(so, sopt)
441 struct socket *so;
442 struct sockopt *sopt;
443{
444 struct unpcb *unp = sotounpcb(so);
445 int error;
446
447 switch (sopt->sopt_dir) {
448 case SOPT_GET:
449 switch (sopt->sopt_name) {
450 case LOCAL_PEERCRED:
451 if (unp->unp_flags & UNP_HAVEPC)
452 error = sooptcopyout(sopt, &unp->unp_peercred,
453 sizeof(unp->unp_peercred));
454 else {
455 if (so->so_type == SOCK_STREAM)
456 error = ENOTCONN;
457 else
458 error = EINVAL;
459 }
460 break;
461 default:
462 error = EOPNOTSUPP;
463 break;
464 }
465 break;
466 case SOPT_SET:
467 default:
468 error = EOPNOTSUPP;
469 break;
470 }
471 return (error);
472}
473
474/*
475 * Both send and receive buffers are allocated PIPSIZ bytes of buffering
476 * for stream sockets, although the total for sender and receiver is
477 * actually only PIPSIZ.
478 * Datagram sockets really use the sendspace as the maximum datagram size,
479 * and don't really want to reserve the sendspace. Their recvspace should
480 * be large enough for at least one max-size datagram plus address.
481 */
482#ifndef PIPSIZ
483#define PIPSIZ 8192
484#endif
485static u_long unpst_sendspace = PIPSIZ;
486static u_long unpst_recvspace = PIPSIZ;
487static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
488static u_long unpdg_recvspace = 4*1024;
489
490static int unp_rights; /* file descriptors in flight */
491
492SYSCTL_DECL(_net_local_stream);
493SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
494 &unpst_sendspace, 0, "");
495SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
496 &unpst_recvspace, 0, "");
497SYSCTL_DECL(_net_local_dgram);
498SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
499 &unpdg_sendspace, 0, "");
500SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
501 &unpdg_recvspace, 0, "");
502SYSCTL_DECL(_net_local);
503SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
504
505static int
506unp_attach(so)
507 struct socket *so;
508{
509 register struct unpcb *unp;
510 int error;
511
512 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
513 switch (so->so_type) {
514
515 case SOCK_STREAM:
516 error = soreserve(so, unpst_sendspace, unpst_recvspace);
517 break;
518
519 case SOCK_DGRAM:
520 error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
521 break;
522
523 default:
524 panic("unp_attach");
525 }
526 if (error)
527 return (error);
528 }
529 unp = zalloc(unp_zone);
530 if (unp == NULL)
531 return (ENOBUFS);
532 bzero(unp, sizeof *unp);
533 unp->unp_gencnt = ++unp_gencnt;
534 unp_count++;
535 LIST_INIT(&unp->unp_refs);
536 unp->unp_socket = so;
|
537 unp->unp_rvnode = curproc->p_fd->fd_rdir;
| 537 unp->unp_rvnode = curthread->td_proc->p_fd->fd_rdir;
|
538 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
539 : &unp_shead, unp, unp_link);
540 so->so_pcb = (caddr_t)unp;
541 return (0);
542}
543
544static void
545unp_detach(unp)
546 register struct unpcb *unp;
547{
548 LIST_REMOVE(unp, unp_link);
549 unp->unp_gencnt = ++unp_gencnt;
550 --unp_count;
551 if (unp->unp_vnode) {
552 unp->unp_vnode->v_socket = 0;
553 vrele(unp->unp_vnode);
554 unp->unp_vnode = 0;
555 }
556 if (unp->unp_conn)
557 unp_disconnect(unp);
558 while (!LIST_EMPTY(&unp->unp_refs))
559 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET);
560 soisdisconnected(unp->unp_socket);
561 unp->unp_socket->so_pcb = 0;
562 if (unp_rights) {
563 /*
564 * Normally the receive buffer is flushed later,
565 * in sofree, but if our receive buffer holds references
566 * to descriptors that are now garbage, we will dispose
567 * of those descriptor references after the garbage collector
568 * gets them (resulting in a "panic: closef: count < 0").
569 */
570 sorflush(unp->unp_socket);
571 unp_gc();
572 }
573 if (unp->unp_addr)
574 FREE(unp->unp_addr, M_SONAME);
575 zfree(unp_zone, unp);
576}
577
578static int
| 538 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
539 : &unp_shead, unp, unp_link);
540 so->so_pcb = (caddr_t)unp;
541 return (0);
542}
543
544static void
545unp_detach(unp)
546 register struct unpcb *unp;
547{
548 LIST_REMOVE(unp, unp_link);
549 unp->unp_gencnt = ++unp_gencnt;
550 --unp_count;
551 if (unp->unp_vnode) {
552 unp->unp_vnode->v_socket = 0;
553 vrele(unp->unp_vnode);
554 unp->unp_vnode = 0;
555 }
556 if (unp->unp_conn)
557 unp_disconnect(unp);
558 while (!LIST_EMPTY(&unp->unp_refs))
559 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET);
560 soisdisconnected(unp->unp_socket);
561 unp->unp_socket->so_pcb = 0;
562 if (unp_rights) {
563 /*
564 * Normally the receive buffer is flushed later,
565 * in sofree, but if our receive buffer holds references
566 * to descriptors that are now garbage, we will dispose
567 * of those descriptor references after the garbage collector
568 * gets them (resulting in a "panic: closef: count < 0").
569 */
570 sorflush(unp->unp_socket);
571 unp_gc();
572 }
573 if (unp->unp_addr)
574 FREE(unp->unp_addr, M_SONAME);
575 zfree(unp_zone, unp);
576}
577
578static int
|
579unp_bind(unp, nam, p)
| 579unp_bind(unp, nam, td)
|
580 struct unpcb *unp;
581 struct sockaddr *nam;
| 580 struct unpcb *unp;
581 struct sockaddr *nam;
|
582 struct proc *p;
| 582 struct thread *td;
|
583{
584 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
585 struct vnode *vp;
586 struct mount *mp;
587 struct vattr vattr;
588 int error, namelen;
589 struct nameidata nd;
590 char *buf;
591
592 if (unp->unp_vnode != NULL)
593 return (EINVAL);
594 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
595 if (namelen <= 0)
596 return EINVAL;
597 buf = malloc(SOCK_MAXADDRLEN, M_TEMP, M_WAITOK);
598 strncpy(buf, soun->sun_path, namelen);
599 buf[namelen] = 0; /* null-terminate the string */
600restart:
601 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT, UIO_SYSSPACE,
| 583{
584 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
585 struct vnode *vp;
586 struct mount *mp;
587 struct vattr vattr;
588 int error, namelen;
589 struct nameidata nd;
590 char *buf;
591
592 if (unp->unp_vnode != NULL)
593 return (EINVAL);
594 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
595 if (namelen <= 0)
596 return EINVAL;
597 buf = malloc(SOCK_MAXADDRLEN, M_TEMP, M_WAITOK);
598 strncpy(buf, soun->sun_path, namelen);
599 buf[namelen] = 0; /* null-terminate the string */
600restart:
601 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT, UIO_SYSSPACE,
|
602 buf, p);
| 602 buf, td);
|
603/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
604 error = namei(&nd);
605 if (error) {
606 free(buf, M_TEMP);
607 return (error);
608 }
609 vp = nd.ni_vp;
610 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
611 NDFREE(&nd, NDF_ONLY_PNBUF);
612 if (nd.ni_dvp == vp)
613 vrele(nd.ni_dvp);
614 else
615 vput(nd.ni_dvp);
616 if (vp != NULL) {
617 vrele(vp);
618 free(buf, M_TEMP);
619 return (EADDRINUSE);
620 }
621 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
622 if (error) {
623 free(buf, M_TEMP);
624 return (error);
625 }
626 goto restart;
627 }
628 VATTR_NULL(&vattr);
629 vattr.va_type = VSOCK;
| 603/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
604 error = namei(&nd);
605 if (error) {
606 free(buf, M_TEMP);
607 return (error);
608 }
609 vp = nd.ni_vp;
610 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
611 NDFREE(&nd, NDF_ONLY_PNBUF);
612 if (nd.ni_dvp == vp)
613 vrele(nd.ni_dvp);
614 else
615 vput(nd.ni_dvp);
616 if (vp != NULL) {
617 vrele(vp);
618 free(buf, M_TEMP);
619 return (EADDRINUSE);
620 }
621 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
622 if (error) {
623 free(buf, M_TEMP);
624 return (error);
625 }
626 goto restart;
627 }
628 VATTR_NULL(&vattr);
629 vattr.va_type = VSOCK;
|
630 vattr.va_mode = (ACCESSPERMS & ~p->p_fd->fd_cmask);
631 VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
| 630 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
631 VOP_LEASE(nd.ni_dvp, td, td->td_proc->p_ucred, LEASE_WRITE);
|
632 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
633 NDFREE(&nd, NDF_ONLY_PNBUF);
634 vput(nd.ni_dvp);
635 if (error) {
636 free(buf, M_TEMP);
637 return (error);
638 }
639 vp = nd.ni_vp;
640 vp->v_socket = unp->unp_socket;
641 unp->unp_vnode = vp;
642 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
| 632 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
633 NDFREE(&nd, NDF_ONLY_PNBUF);
634 vput(nd.ni_dvp);
635 if (error) {
636 free(buf, M_TEMP);
637 return (error);
638 }
639 vp = nd.ni_vp;
640 vp->v_socket = unp->unp_socket;
641 unp->unp_vnode = vp;
642 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
|
643 VOP_UNLOCK(vp, 0, p);
| 643 VOP_UNLOCK(vp, 0, td);
|
644 vn_finished_write(mp);
645 free(buf, M_TEMP);
646 return (0);
647}
648
649static int
| 644 vn_finished_write(mp);
645 free(buf, M_TEMP);
646 return (0);
647}
648
649static int
|
650unp_connect(so, nam, p)
| 650unp_connect(so, nam, td)
|
651 struct socket *so;
652 struct sockaddr *nam;
| 651 struct socket *so;
652 struct sockaddr *nam;
|
653 struct proc *p;
| 653 struct thread *td;
|
654{
655 register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
656 register struct vnode *vp;
657 register struct socket *so2, *so3;
658 struct unpcb *unp, *unp2, *unp3;
659 int error, len;
660 struct nameidata nd;
661 char buf[SOCK_MAXADDRLEN];
662
663 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
664 if (len <= 0)
665 return EINVAL;
666 strncpy(buf, soun->sun_path, len);
667 buf[len] = 0;
668
| 654{
655 register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
656 register struct vnode *vp;
657 register struct socket *so2, *so3;
658 struct unpcb *unp, *unp2, *unp3;
659 int error, len;
660 struct nameidata nd;
661 char buf[SOCK_MAXADDRLEN];
662
663 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
664 if (len <= 0)
665 return EINVAL;
666 strncpy(buf, soun->sun_path, len);
667 buf[len] = 0;
668
|
669 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, p);
| 669 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td);
|
670 error = namei(&nd);
671 if (error)
672 return (error);
673 vp = nd.ni_vp;
674 NDFREE(&nd, NDF_ONLY_PNBUF);
675 if (vp->v_type != VSOCK) {
676 error = ENOTSOCK;
677 goto bad;
678 }
| 670 error = namei(&nd);
671 if (error)
672 return (error);
673 vp = nd.ni_vp;
674 NDFREE(&nd, NDF_ONLY_PNBUF);
675 if (vp->v_type != VSOCK) {
676 error = ENOTSOCK;
677 goto bad;
678 }
|
679 error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p);
| 679 error = VOP_ACCESS(vp, VWRITE, td->td_proc->p_ucred, td);
|
680 if (error)
681 goto bad;
682 so2 = vp->v_socket;
683 if (so2 == 0) {
684 error = ECONNREFUSED;
685 goto bad;
686 }
687 if (so->so_type != so2->so_type) {
688 error = EPROTOTYPE;
689 goto bad;
690 }
691 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
692 if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
| 680 if (error)
681 goto bad;
682 so2 = vp->v_socket;
683 if (so2 == 0) {
684 error = ECONNREFUSED;
685 goto bad;
686 }
687 if (so->so_type != so2->so_type) {
688 error = EPROTOTYPE;
689 goto bad;
690 }
691 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
692 if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
|
693 (so3 = sonewconn3(so2, 0, p)) == 0) {
| 693 (so3 = sonewconn3(so2, 0, td)) == 0) {
|
694 error = ECONNREFUSED;
695 goto bad;
696 }
697 unp = sotounpcb(so);
698 unp2 = sotounpcb(so2);
699 unp3 = sotounpcb(so3);
700 if (unp2->unp_addr)
701 unp3->unp_addr = (struct sockaddr_un *)
702 dup_sockaddr((struct sockaddr *)
703 unp2->unp_addr, 1);
704
705 /*
706 * unp_peercred management:
707 *
708 * The connecter's (client's) credentials are copied
709 * from its process structure at the time of connect()
710 * (which is now).
711 */
712 memset(&unp3->unp_peercred, '\0', sizeof(unp3->unp_peercred));
| 694 error = ECONNREFUSED;
695 goto bad;
696 }
697 unp = sotounpcb(so);
698 unp2 = sotounpcb(so2);
699 unp3 = sotounpcb(so3);
700 if (unp2->unp_addr)
701 unp3->unp_addr = (struct sockaddr_un *)
702 dup_sockaddr((struct sockaddr *)
703 unp2->unp_addr, 1);
704
705 /*
706 * unp_peercred management:
707 *
708 * The connecter's (client's) credentials are copied
709 * from its process structure at the time of connect()
710 * (which is now).
711 */
712 memset(&unp3->unp_peercred, '\0', sizeof(unp3->unp_peercred));
|
713 unp3->unp_peercred.cr_uid = p->p_ucred->cr_uid;
714 unp3->unp_peercred.cr_ngroups = p->p_ucred->cr_ngroups;
715 memcpy(unp3->unp_peercred.cr_groups, p->p_ucred->cr_groups,
| 713 unp3->unp_peercred.cr_uid = td->td_proc->p_ucred->cr_uid;
714 unp3->unp_peercred.cr_ngroups = td->td_proc->p_ucred->cr_ngroups;
715 memcpy(unp3->unp_peercred.cr_groups, td->td_proc->p_ucred->cr_groups,
|
716 sizeof(unp3->unp_peercred.cr_groups));
717 unp3->unp_flags |= UNP_HAVEPC;
718 /*
719 * The receiver's (server's) credentials are copied
720 * from the unp_peercred member of socket on which the
721 * former called listen(); unp_listen() cached that
722 * process's credentials at that time so we can use
723 * them now.
724 */
725 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
726 ("unp_connect: listener without cached peercred"));
727 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
728 sizeof(unp->unp_peercred));
729 unp->unp_flags |= UNP_HAVEPC;
730
731 so2 = so3;
732 }
733 error = unp_connect2(so, so2);
734bad:
735 vput(vp);
736 return (error);
737}
738
739int
740unp_connect2(so, so2)
741 register struct socket *so;
742 register struct socket *so2;
743{
744 register struct unpcb *unp = sotounpcb(so);
745 register struct unpcb *unp2;
746
747 if (so2->so_type != so->so_type)
748 return (EPROTOTYPE);
749 unp2 = sotounpcb(so2);
750 unp->unp_conn = unp2;
751 switch (so->so_type) {
752
753 case SOCK_DGRAM:
754 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
755 soisconnected(so);
756 break;
757
758 case SOCK_STREAM:
759 unp2->unp_conn = unp;
760 soisconnected(so);
761 soisconnected(so2);
762 break;
763
764 default:
765 panic("unp_connect2");
766 }
767 return (0);
768}
769
770static void
771unp_disconnect(unp)
772 struct unpcb *unp;
773{
774 register struct unpcb *unp2 = unp->unp_conn;
775
776 if (unp2 == 0)
777 return;
778 unp->unp_conn = 0;
779 switch (unp->unp_socket->so_type) {
780
781 case SOCK_DGRAM:
782 LIST_REMOVE(unp, unp_reflink);
783 unp->unp_socket->so_state &= ~SS_ISCONNECTED;
784 break;
785
786 case SOCK_STREAM:
787 soisdisconnected(unp->unp_socket);
788 unp2->unp_conn = 0;
789 soisdisconnected(unp2->unp_socket);
790 break;
791 }
792}
793
794#ifdef notdef
795void
796unp_abort(unp)
797 struct unpcb *unp;
798{
799
800 unp_detach(unp);
801}
802#endif
803
804static int
805prison_unpcb(struct proc *p, struct unpcb *unp)
806{
807 if (!jailed(p->p_ucred))
808 return (0);
809 if (p->p_fd->fd_rdir == unp->unp_rvnode)
810 return (0);
811 return (1);
812}
813
814static int
815unp_pcblist(SYSCTL_HANDLER_ARGS)
816{
817 int error, i, n;
818 struct unpcb *unp, **unp_list;
819 unp_gen_t gencnt;
820 struct xunpgen *xug;
821 struct unp_head *head;
822 struct xunpcb *xu;
823
824 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
825
826 /*
827 * The process of preparing the PCB list is too time-consuming and
828 * resource-intensive to repeat twice on every request.
829 */
830 if (req->oldptr == 0) {
831 n = unp_count;
832 req->oldidx = 2 * (sizeof *xug)
833 + (n + n/8) * sizeof(struct xunpcb);
834 return 0;
835 }
836
837 if (req->newptr != 0)
838 return EPERM;
839
840 /*
841 * OK, now we're committed to doing something.
842 */
843 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
844 gencnt = unp_gencnt;
845 n = unp_count;
846
847 xug->xug_len = sizeof *xug;
848 xug->xug_count = n;
849 xug->xug_gen = gencnt;
850 xug->xug_sogen = so_gencnt;
851 error = SYSCTL_OUT(req, xug, sizeof *xug);
852 if (error) {
853 free(xug, M_TEMP);
854 return error;
855 }
856
857 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
858
859 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
860 unp = LIST_NEXT(unp, unp_link)) {
861 if (unp->unp_gencnt <= gencnt && !prison_unpcb(req->p, unp))
862 unp_list[i++] = unp;
863 }
864 n = i; /* in case we lost some during malloc */
865
866 error = 0;
867 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
868 for (i = 0; i < n; i++) {
869 unp = unp_list[i];
870 if (unp->unp_gencnt <= gencnt) {
871 xu->xu_len = sizeof *xu;
872 xu->xu_unpp = unp;
873 /*
874 * XXX - need more locking here to protect against
875 * connect/disconnect races for SMP.
876 */
877 if (unp->unp_addr)
878 bcopy(unp->unp_addr, &xu->xu_addr,
879 unp->unp_addr->sun_len);
880 if (unp->unp_conn && unp->unp_conn->unp_addr)
881 bcopy(unp->unp_conn->unp_addr,
882 &xu->xu_caddr,
883 unp->unp_conn->unp_addr->sun_len);
884 bcopy(unp, &xu->xu_unp, sizeof *unp);
885 sotoxsocket(unp->unp_socket, &xu->xu_socket);
886 error = SYSCTL_OUT(req, xu, sizeof *xu);
887 }
888 }
889 free(xu, M_TEMP);
890 if (!error) {
891 /*
892 * Give the user an updated idea of our state.
893 * If the generation differs from what we told
894 * her before, she knows that something happened
895 * while we were processing this request, and it
896 * might be necessary to retry.
897 */
898 xug->xug_gen = unp_gencnt;
899 xug->xug_sogen = so_gencnt;
900 xug->xug_count = unp_count;
901 error = SYSCTL_OUT(req, xug, sizeof *xug);
902 }
903 free(unp_list, M_TEMP);
904 free(xug, M_TEMP);
905 return error;
906}
907
908SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
909 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
910 "List of active local datagram sockets");
911SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
912 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
913 "List of active local stream sockets");
914
915static void
916unp_shutdown(unp)
917 struct unpcb *unp;
918{
919 struct socket *so;
920
921 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
922 (so = unp->unp_conn->unp_socket))
923 socantrcvmore(so);
924}
925
926static void
927unp_drop(unp, errno)
928 struct unpcb *unp;
929 int errno;
930{
931 struct socket *so = unp->unp_socket;
932
933 so->so_error = errno;
934 unp_disconnect(unp);
935 if (so->so_head) {
936 LIST_REMOVE(unp, unp_link);
937 unp->unp_gencnt = ++unp_gencnt;
938 unp_count--;
939 so->so_pcb = (caddr_t) 0;
940 if (unp->unp_addr)
941 FREE(unp->unp_addr, M_SONAME);
942 zfree(unp_zone, unp);
943 sofree(so);
944 }
945}
946
947#ifdef notdef
948void
949unp_drain()
950{
951
952}
953#endif
954
955int
956unp_externalize(rights)
957 struct mbuf *rights;
958{
| 716 sizeof(unp3->unp_peercred.cr_groups));
717 unp3->unp_flags |= UNP_HAVEPC;
718 /*
719 * The receiver's (server's) credentials are copied
720 * from the unp_peercred member of socket on which the
721 * former called listen(); unp_listen() cached that
722 * process's credentials at that time so we can use
723 * them now.
724 */
725 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
726 ("unp_connect: listener without cached peercred"));
727 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
728 sizeof(unp->unp_peercred));
729 unp->unp_flags |= UNP_HAVEPC;
730
731 so2 = so3;
732 }
733 error = unp_connect2(so, so2);
734bad:
735 vput(vp);
736 return (error);
737}
738
739int
740unp_connect2(so, so2)
741 register struct socket *so;
742 register struct socket *so2;
743{
744 register struct unpcb *unp = sotounpcb(so);
745 register struct unpcb *unp2;
746
747 if (so2->so_type != so->so_type)
748 return (EPROTOTYPE);
749 unp2 = sotounpcb(so2);
750 unp->unp_conn = unp2;
751 switch (so->so_type) {
752
753 case SOCK_DGRAM:
754 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
755 soisconnected(so);
756 break;
757
758 case SOCK_STREAM:
759 unp2->unp_conn = unp;
760 soisconnected(so);
761 soisconnected(so2);
762 break;
763
764 default:
765 panic("unp_connect2");
766 }
767 return (0);
768}
769
770static void
771unp_disconnect(unp)
772 struct unpcb *unp;
773{
774 register struct unpcb *unp2 = unp->unp_conn;
775
776 if (unp2 == 0)
777 return;
778 unp->unp_conn = 0;
779 switch (unp->unp_socket->so_type) {
780
781 case SOCK_DGRAM:
782 LIST_REMOVE(unp, unp_reflink);
783 unp->unp_socket->so_state &= ~SS_ISCONNECTED;
784 break;
785
786 case SOCK_STREAM:
787 soisdisconnected(unp->unp_socket);
788 unp2->unp_conn = 0;
789 soisdisconnected(unp2->unp_socket);
790 break;
791 }
792}
793
794#ifdef notdef
795void
796unp_abort(unp)
797 struct unpcb *unp;
798{
799
800 unp_detach(unp);
801}
802#endif
803
804static int
805prison_unpcb(struct proc *p, struct unpcb *unp)
806{
807 if (!jailed(p->p_ucred))
808 return (0);
809 if (p->p_fd->fd_rdir == unp->unp_rvnode)
810 return (0);
811 return (1);
812}
813
814static int
815unp_pcblist(SYSCTL_HANDLER_ARGS)
816{
817 int error, i, n;
818 struct unpcb *unp, **unp_list;
819 unp_gen_t gencnt;
820 struct xunpgen *xug;
821 struct unp_head *head;
822 struct xunpcb *xu;
823
824 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
825
826 /*
827 * The process of preparing the PCB list is too time-consuming and
828 * resource-intensive to repeat twice on every request.
829 */
830 if (req->oldptr == 0) {
831 n = unp_count;
832 req->oldidx = 2 * (sizeof *xug)
833 + (n + n/8) * sizeof(struct xunpcb);
834 return 0;
835 }
836
837 if (req->newptr != 0)
838 return EPERM;
839
840 /*
841 * OK, now we're committed to doing something.
842 */
843 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
844 gencnt = unp_gencnt;
845 n = unp_count;
846
847 xug->xug_len = sizeof *xug;
848 xug->xug_count = n;
849 xug->xug_gen = gencnt;
850 xug->xug_sogen = so_gencnt;
851 error = SYSCTL_OUT(req, xug, sizeof *xug);
852 if (error) {
853 free(xug, M_TEMP);
854 return error;
855 }
856
857 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
858
859 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
860 unp = LIST_NEXT(unp, unp_link)) {
861 if (unp->unp_gencnt <= gencnt && !prison_unpcb(req->p, unp))
862 unp_list[i++] = unp;
863 }
864 n = i; /* in case we lost some during malloc */
865
866 error = 0;
867 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
868 for (i = 0; i < n; i++) {
869 unp = unp_list[i];
870 if (unp->unp_gencnt <= gencnt) {
871 xu->xu_len = sizeof *xu;
872 xu->xu_unpp = unp;
873 /*
874 * XXX - need more locking here to protect against
875 * connect/disconnect races for SMP.
876 */
877 if (unp->unp_addr)
878 bcopy(unp->unp_addr, &xu->xu_addr,
879 unp->unp_addr->sun_len);
880 if (unp->unp_conn && unp->unp_conn->unp_addr)
881 bcopy(unp->unp_conn->unp_addr,
882 &xu->xu_caddr,
883 unp->unp_conn->unp_addr->sun_len);
884 bcopy(unp, &xu->xu_unp, sizeof *unp);
885 sotoxsocket(unp->unp_socket, &xu->xu_socket);
886 error = SYSCTL_OUT(req, xu, sizeof *xu);
887 }
888 }
889 free(xu, M_TEMP);
890 if (!error) {
891 /*
892 * Give the user an updated idea of our state.
893 * If the generation differs from what we told
894 * her before, she knows that something happened
895 * while we were processing this request, and it
896 * might be necessary to retry.
897 */
898 xug->xug_gen = unp_gencnt;
899 xug->xug_sogen = so_gencnt;
900 xug->xug_count = unp_count;
901 error = SYSCTL_OUT(req, xug, sizeof *xug);
902 }
903 free(unp_list, M_TEMP);
904 free(xug, M_TEMP);
905 return error;
906}
907
908SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
909 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
910 "List of active local datagram sockets");
911SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
912 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
913 "List of active local stream sockets");
914
915static void
916unp_shutdown(unp)
917 struct unpcb *unp;
918{
919 struct socket *so;
920
921 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
922 (so = unp->unp_conn->unp_socket))
923 socantrcvmore(so);
924}
925
926static void
927unp_drop(unp, errno)
928 struct unpcb *unp;
929 int errno;
930{
931 struct socket *so = unp->unp_socket;
932
933 so->so_error = errno;
934 unp_disconnect(unp);
935 if (so->so_head) {
936 LIST_REMOVE(unp, unp_link);
937 unp->unp_gencnt = ++unp_gencnt;
938 unp_count--;
939 so->so_pcb = (caddr_t) 0;
940 if (unp->unp_addr)
941 FREE(unp->unp_addr, M_SONAME);
942 zfree(unp_zone, unp);
943 sofree(so);
944 }
945}
946
947#ifdef notdef
948void
949unp_drain()
950{
951
952}
953#endif
954
955int
956unp_externalize(rights)
957 struct mbuf *rights;
958{
|
959 struct proc *p = curproc; /* XXX */
| 959 struct thread *td = curthread; /* XXX */
|
960 register int i;
961 register struct cmsghdr *cm = mtod(rights, struct cmsghdr *);
962 register int *fdp;
963 register struct file **rp;
964 register struct file *fp;
965 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm))
966 / sizeof (struct file *);
967 int f;
968
969 /*
970 * if the new FD's will not fit, then we free them all
971 */
| 960 register int i;
961 register struct cmsghdr *cm = mtod(rights, struct cmsghdr *);
962 register int *fdp;
963 register struct file **rp;
964 register struct file *fp;
965 int newfds = (cm->cmsg_len - (CMSG_DATA(cm) - (u_char *)cm))
966 / sizeof (struct file *);
967 int f;
968
969 /*
970 * if the new FD's will not fit, then we free them all
971 */
|
972 if (!fdavail(p, newfds)) {
| 972 if (!fdavail(td, newfds)) {
|
973 rp = (struct file **)CMSG_DATA(cm);
974 for (i = 0; i < newfds; i++) {
975 fp = *rp;
976 /*
977 * zero the pointer before calling unp_discard,
978 * since it may end up in unp_gc()..
979 */
980 *rp++ = 0;
981 unp_discard(fp);
982 }
983 return (EMSGSIZE);
984 }
985 /*
986 * now change each pointer to an fd in the global table to
987 * an integer that is the index to the local fd table entry
988 * that we set up to point to the global one we are transferring.
989 * If sizeof (struct file *) is bigger than or equal to sizeof int,
990 * then do it in forward order. In that case, an integer will
991 * always come in the same place or before its corresponding
992 * struct file pointer.
993 * If sizeof (struct file *) is smaller than sizeof int, then
994 * do it in reverse order.
995 */
996 if (sizeof (struct file *) >= sizeof (int)) {
997 fdp = (int *)(cm + 1);
998 rp = (struct file **)CMSG_DATA(cm);
999 for (i = 0; i < newfds; i++) {
| 973 rp = (struct file **)CMSG_DATA(cm);
974 for (i = 0; i < newfds; i++) {
975 fp = *rp;
976 /*
977 * zero the pointer before calling unp_discard,
978 * since it may end up in unp_gc()..
979 */
980 *rp++ = 0;
981 unp_discard(fp);
982 }
983 return (EMSGSIZE);
984 }
985 /*
986 * now change each pointer to an fd in the global table to
987 * an integer that is the index to the local fd table entry
988 * that we set up to point to the global one we are transferring.
989 * If sizeof (struct file *) is bigger than or equal to sizeof int,
990 * then do it in forward order. In that case, an integer will
991 * always come in the same place or before its corresponding
992 * struct file pointer.
993 * If sizeof (struct file *) is smaller than sizeof int, then
994 * do it in reverse order.
995 */
996 if (sizeof (struct file *) >= sizeof (int)) {
997 fdp = (int *)(cm + 1);
998 rp = (struct file **)CMSG_DATA(cm);
999 for (i = 0; i < newfds; i++) {
|
1000 if (fdalloc(p, 0, &f))
| 1000 if (fdalloc(td, 0, &f))
|
1001 panic("unp_externalize");
1002 fp = *rp++;
| 1001 panic("unp_externalize");
1002 fp = *rp++;
|
1003 p->p_fd->fd_ofiles[f] = fp;
| 1003 td->td_proc->p_fd->fd_ofiles[f] = fp;
|
1004 fp->f_msgcount--;
1005 unp_rights--;
1006 *fdp++ = f;
1007 }
1008 } else {
1009 fdp = (int *)(cm + 1) + newfds - 1;
1010 rp = (struct file **)CMSG_DATA(cm) + newfds - 1;
1011 for (i = 0; i < newfds; i++) {
| 1004 fp->f_msgcount--;
1005 unp_rights--;
1006 *fdp++ = f;
1007 }
1008 } else {
1009 fdp = (int *)(cm + 1) + newfds - 1;
1010 rp = (struct file **)CMSG_DATA(cm) + newfds - 1;
1011 for (i = 0; i < newfds; i++) {
|
1012 if (fdalloc(p, 0, &f))
| 1012 if (fdalloc(td, 0, &f))
|
1013 panic("unp_externalize");
1014 fp = *rp--;
| 1013 panic("unp_externalize");
1014 fp = *rp--;
|
1015 p->p_fd->fd_ofiles[f] = fp;
| 1015 td->td_proc->p_fd->fd_ofiles[f] = fp;
|
1016 fp->f_msgcount--;
1017 unp_rights--;
1018 *fdp-- = f;
1019 }
1020 }
1021
1022 /*
1023 * Adjust length, in case sizeof(struct file *) and sizeof(int)
1024 * differs.
1025 */
1026 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int));
1027 rights->m_len = cm->cmsg_len;
1028 return (0);
1029}
1030
1031void
1032unp_init(void)
1033{
1034 unp_zone = zinit("unpcb", sizeof(struct unpcb), nmbclusters, 0, 0);
1035 if (unp_zone == 0)
1036 panic("unp_init");
1037 LIST_INIT(&unp_dhead);
1038 LIST_INIT(&unp_shead);
1039}
1040
1041#ifndef MIN
1042#define MIN(a,b) (((a)<(b))?(a):(b))
1043#endif
1044
1045static int
| 1016 fp->f_msgcount--;
1017 unp_rights--;
1018 *fdp-- = f;
1019 }
1020 }
1021
1022 /*
1023 * Adjust length, in case sizeof(struct file *) and sizeof(int)
1024 * differs.
1025 */
1026 cm->cmsg_len = CMSG_LEN(newfds * sizeof(int));
1027 rights->m_len = cm->cmsg_len;
1028 return (0);
1029}
1030
1031void
1032unp_init(void)
1033{
1034 unp_zone = zinit("unpcb", sizeof(struct unpcb), nmbclusters, 0, 0);
1035 if (unp_zone == 0)
1036 panic("unp_init");
1037 LIST_INIT(&unp_dhead);
1038 LIST_INIT(&unp_shead);
1039}
1040
1041#ifndef MIN
1042#define MIN(a,b) (((a)<(b))?(a):(b))
1043#endif
1044
1045static int
|
1046unp_internalize(control, p)
| 1046unp_internalize(control, td)
|
1047 struct mbuf *control;
| 1047 struct mbuf *control;
|
1048 struct proc *p;
| 1048 struct thread *td;
|
1049{
| 1049{
|
| 1050 struct proc *p = td->td_proc;
|
1050 struct filedesc *fdescp = p->p_fd;
1051 register struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1052 register struct file **rp;
1053 register struct file *fp;
1054 register int i, fd, *fdp;
1055 register struct cmsgcred *cmcred;
1056 int oldfds;
1057 u_int newlen;
1058
1059 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) ||
1060 cm->cmsg_level != SOL_SOCKET || cm->cmsg_len != control->m_len)
1061 return (EINVAL);
1062
1063 /*
1064 * Fill in credential information.
1065 */
1066 if (cm->cmsg_type == SCM_CREDS) {
1067 cmcred = (struct cmsgcred *)(cm + 1);
1068 cmcred->cmcred_pid = p->p_pid;
1069 cmcred->cmcred_uid = p->p_ucred->cr_ruid;
1070 cmcred->cmcred_gid = p->p_ucred->cr_rgid;
1071 cmcred->cmcred_euid = p->p_ucred->cr_uid;
1072 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups,
1073 CMGROUP_MAX);
1074 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1075 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i];
1076 return(0);
1077 }
1078
1079 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int);
1080 /*
1081 * check that all the FDs passed in refer to legal OPEN files
1082 * If not, reject the entire operation.
1083 */
1084 fdp = (int *)(cm + 1);
1085 for (i = 0; i < oldfds; i++) {
1086 fd = *fdp++;
1087 if ((unsigned)fd >= fdescp->fd_nfiles ||
1088 fdescp->fd_ofiles[fd] == NULL)
1089 return (EBADF);
1090 }
1091 /*
1092 * Now replace the integer FDs with pointers to
1093 * the associated global file table entry..
1094 * Allocate a bigger buffer as necessary. But if an cluster is not
1095 * enough, return E2BIG.
1096 */
1097 newlen = CMSG_LEN(oldfds * sizeof(struct file *));
1098 if (newlen > MCLBYTES)
1099 return (E2BIG);
1100 if (newlen - control->m_len > M_TRAILINGSPACE(control)) {
1101 if (control->m_flags & M_EXT)
1102 return (E2BIG);
1103 MCLGET(control, M_TRYWAIT);
1104 if ((control->m_flags & M_EXT) == 0)
1105 return (ENOBUFS);
1106
1107 /* copy the data to the cluster */
1108 memcpy(mtod(control, char *), cm, cm->cmsg_len);
1109 cm = mtod(control, struct cmsghdr *);
1110 }
1111
1112 /*
1113 * Adjust length, in case sizeof(struct file *) and sizeof(int)
1114 * differs.
1115 */
1116 control->m_len = cm->cmsg_len = newlen;
1117
1118 /*
1119 * Transform the file descriptors into struct file pointers.
1120 * If sizeof (struct file *) is bigger than or equal to sizeof int,
1121 * then do it in reverse order so that the int won't get until
1122 * we're done.
1123 * If sizeof (struct file *) is smaller than sizeof int, then
1124 * do it in forward order.
1125 */
1126 if (sizeof (struct file *) >= sizeof (int)) {
1127 fdp = (int *)(cm + 1) + oldfds - 1;
1128 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1;
1129 for (i = 0; i < oldfds; i++) {
1130 fp = fdescp->fd_ofiles[*fdp--];
1131 *rp-- = fp;
1132 fp->f_count++;
1133 fp->f_msgcount++;
1134 unp_rights++;
1135 }
1136 } else {
1137 fdp = (int *)(cm + 1);
1138 rp = (struct file **)CMSG_DATA(cm);
1139 for (i = 0; i < oldfds; i++) {
1140 fp = fdescp->fd_ofiles[*fdp++];
1141 *rp++ = fp;
1142 fp->f_count++;
1143 fp->f_msgcount++;
1144 unp_rights++;
1145 }
1146 }
1147 return (0);
1148}
1149
1150static int unp_defer, unp_gcing;
1151
1152static void
1153unp_gc()
1154{
1155 register struct file *fp, *nextfp;
1156 register struct socket *so;
1157 struct file **extra_ref, **fpp;
1158 int nunref, i;
1159
1160 if (unp_gcing)
1161 return;
1162 unp_gcing = 1;
1163 unp_defer = 0;
1164 /*
1165 * before going through all this, set all FDs to
1166 * be NOT defered and NOT externally accessible
1167 */
1168 LIST_FOREACH(fp, &filehead, f_list)
1169 fp->f_flag &= ~(FMARK|FDEFER);
1170 do {
1171 LIST_FOREACH(fp, &filehead, f_list) {
1172 /*
1173 * If the file is not open, skip it
1174 */
1175 if (fp->f_count == 0)
1176 continue;
1177 /*
1178 * If we already marked it as 'defer' in a
1179 * previous pass, then try process it this time
1180 * and un-mark it
1181 */
1182 if (fp->f_flag & FDEFER) {
1183 fp->f_flag &= ~FDEFER;
1184 unp_defer--;
1185 } else {
1186 /*
1187 * if it's not defered, then check if it's
1188 * already marked.. if so skip it
1189 */
1190 if (fp->f_flag & FMARK)
1191 continue;
1192 /*
1193 * If all references are from messages
1194 * in transit, then skip it. it's not
1195 * externally accessible.
1196 */
1197 if (fp->f_count == fp->f_msgcount)
1198 continue;
1199 /*
1200 * If it got this far then it must be
1201 * externally accessible.
1202 */
1203 fp->f_flag |= FMARK;
1204 }
1205 /*
1206 * either it was defered, or it is externally
1207 * accessible and not already marked so.
1208 * Now check if it is possibly one of OUR sockets.
1209 */
1210 if (fp->f_type != DTYPE_SOCKET ||
1211 (so = (struct socket *)fp->f_data) == 0)
1212 continue;
1213 if (so->so_proto->pr_domain != &localdomain ||
1214 (so->so_proto->pr_flags&PR_RIGHTS) == 0)
1215 continue;
1216#ifdef notdef
1217 if (so->so_rcv.sb_flags & SB_LOCK) {
1218 /*
1219 * This is problematical; it's not clear
1220 * we need to wait for the sockbuf to be
1221 * unlocked (on a uniprocessor, at least),
1222 * and it's also not clear what to do
1223 * if sbwait returns an error due to receipt
1224 * of a signal. If sbwait does return
1225 * an error, we'll go into an infinite
1226 * loop. Delete all of this for now.
1227 */
1228 (void) sbwait(&so->so_rcv);
1229 goto restart;
1230 }
1231#endif
1232 /*
1233 * So, Ok, it's one of our sockets and it IS externally
1234 * accessible (or was defered). Now we look
1235 * to see if we hold any file descriptors in its
1236 * message buffers. Follow those links and mark them
1237 * as accessible too.
1238 */
1239 unp_scan(so->so_rcv.sb_mb, unp_mark);
1240 }
1241 } while (unp_defer);
1242 /*
1243 * We grab an extra reference to each of the file table entries
1244 * that are not otherwise accessible and then free the rights
1245 * that are stored in messages on them.
1246 *
1247 * The bug in the orginal code is a little tricky, so I'll describe
1248 * what's wrong with it here.
1249 *
1250 * It is incorrect to simply unp_discard each entry for f_msgcount
1251 * times -- consider the case of sockets A and B that contain
1252 * references to each other. On a last close of some other socket,
1253 * we trigger a gc since the number of outstanding rights (unp_rights)
1254 * is non-zero. If during the sweep phase the gc code un_discards,
1255 * we end up doing a (full) closef on the descriptor. A closef on A
1256 * results in the following chain. Closef calls soo_close, which
1257 * calls soclose. Soclose calls first (through the switch
1258 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
1259 * returns because the previous instance had set unp_gcing, and
1260 * we return all the way back to soclose, which marks the socket
1261 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
1262 * to free up the rights that are queued in messages on the socket A,
1263 * i.e., the reference on B. The sorflush calls via the dom_dispose
1264 * switch unp_dispose, which unp_scans with unp_discard. This second
1265 * instance of unp_discard just calls closef on B.
1266 *
1267 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1268 * which results in another closef on A. Unfortunately, A is already
1269 * being closed, and the descriptor has already been marked with
1270 * SS_NOFDREF, and soclose panics at this point.
1271 *
1272 * Here, we first take an extra reference to each inaccessible
1273 * descriptor. Then, we call sorflush ourself, since we know
1274 * it is a Unix domain socket anyhow. After we destroy all the
1275 * rights carried in messages, we do a last closef to get rid
1276 * of our extra reference. This is the last close, and the
1277 * unp_detach etc will shut down the socket.
1278 *
1279 * 91/09/19, bsy@cs.cmu.edu
1280 */
1281 extra_ref = malloc(nfiles * sizeof(struct file *), M_FILE, M_WAITOK);
1282 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0;
1283 fp = nextfp) {
1284 nextfp = LIST_NEXT(fp, f_list);
1285 /*
1286 * If it's not open, skip it
1287 */
1288 if (fp->f_count == 0)
1289 continue;
1290 /*
1291 * If all refs are from msgs, and it's not marked accessible
1292 * then it must be referenced from some unreachable cycle
1293 * of (shut-down) FDs, so include it in our
1294 * list of FDs to remove
1295 */
1296 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) {
1297 *fpp++ = fp;
1298 nunref++;
1299 fp->f_count++;
1300 }
1301 }
1302 /*
1303 * for each FD on our hit list, do the following two things
1304 */
1305 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
1306 struct file *tfp = *fpp;
1307 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL)
1308 sorflush((struct socket *)(tfp->f_data));
1309 }
1310 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
| 1051 struct filedesc *fdescp = p->p_fd;
1052 register struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1053 register struct file **rp;
1054 register struct file *fp;
1055 register int i, fd, *fdp;
1056 register struct cmsgcred *cmcred;
1057 int oldfds;
1058 u_int newlen;
1059
1060 if ((cm->cmsg_type != SCM_RIGHTS && cm->cmsg_type != SCM_CREDS) ||
1061 cm->cmsg_level != SOL_SOCKET || cm->cmsg_len != control->m_len)
1062 return (EINVAL);
1063
1064 /*
1065 * Fill in credential information.
1066 */
1067 if (cm->cmsg_type == SCM_CREDS) {
1068 cmcred = (struct cmsgcred *)(cm + 1);
1069 cmcred->cmcred_pid = p->p_pid;
1070 cmcred->cmcred_uid = p->p_ucred->cr_ruid;
1071 cmcred->cmcred_gid = p->p_ucred->cr_rgid;
1072 cmcred->cmcred_euid = p->p_ucred->cr_uid;
1073 cmcred->cmcred_ngroups = MIN(p->p_ucred->cr_ngroups,
1074 CMGROUP_MAX);
1075 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1076 cmcred->cmcred_groups[i] = p->p_ucred->cr_groups[i];
1077 return(0);
1078 }
1079
1080 oldfds = (cm->cmsg_len - sizeof (*cm)) / sizeof (int);
1081 /*
1082 * check that all the FDs passed in refer to legal OPEN files
1083 * If not, reject the entire operation.
1084 */
1085 fdp = (int *)(cm + 1);
1086 for (i = 0; i < oldfds; i++) {
1087 fd = *fdp++;
1088 if ((unsigned)fd >= fdescp->fd_nfiles ||
1089 fdescp->fd_ofiles[fd] == NULL)
1090 return (EBADF);
1091 }
1092 /*
1093 * Now replace the integer FDs with pointers to
1094 * the associated global file table entry..
1095 * Allocate a bigger buffer as necessary. But if an cluster is not
1096 * enough, return E2BIG.
1097 */
1098 newlen = CMSG_LEN(oldfds * sizeof(struct file *));
1099 if (newlen > MCLBYTES)
1100 return (E2BIG);
1101 if (newlen - control->m_len > M_TRAILINGSPACE(control)) {
1102 if (control->m_flags & M_EXT)
1103 return (E2BIG);
1104 MCLGET(control, M_TRYWAIT);
1105 if ((control->m_flags & M_EXT) == 0)
1106 return (ENOBUFS);
1107
1108 /* copy the data to the cluster */
1109 memcpy(mtod(control, char *), cm, cm->cmsg_len);
1110 cm = mtod(control, struct cmsghdr *);
1111 }
1112
1113 /*
1114 * Adjust length, in case sizeof(struct file *) and sizeof(int)
1115 * differs.
1116 */
1117 control->m_len = cm->cmsg_len = newlen;
1118
1119 /*
1120 * Transform the file descriptors into struct file pointers.
1121 * If sizeof (struct file *) is bigger than or equal to sizeof int,
1122 * then do it in reverse order so that the int won't get until
1123 * we're done.
1124 * If sizeof (struct file *) is smaller than sizeof int, then
1125 * do it in forward order.
1126 */
1127 if (sizeof (struct file *) >= sizeof (int)) {
1128 fdp = (int *)(cm + 1) + oldfds - 1;
1129 rp = (struct file **)CMSG_DATA(cm) + oldfds - 1;
1130 for (i = 0; i < oldfds; i++) {
1131 fp = fdescp->fd_ofiles[*fdp--];
1132 *rp-- = fp;
1133 fp->f_count++;
1134 fp->f_msgcount++;
1135 unp_rights++;
1136 }
1137 } else {
1138 fdp = (int *)(cm + 1);
1139 rp = (struct file **)CMSG_DATA(cm);
1140 for (i = 0; i < oldfds; i++) {
1141 fp = fdescp->fd_ofiles[*fdp++];
1142 *rp++ = fp;
1143 fp->f_count++;
1144 fp->f_msgcount++;
1145 unp_rights++;
1146 }
1147 }
1148 return (0);
1149}
1150
1151static int unp_defer, unp_gcing;
1152
1153static void
1154unp_gc()
1155{
1156 register struct file *fp, *nextfp;
1157 register struct socket *so;
1158 struct file **extra_ref, **fpp;
1159 int nunref, i;
1160
1161 if (unp_gcing)
1162 return;
1163 unp_gcing = 1;
1164 unp_defer = 0;
1165 /*
1166 * before going through all this, set all FDs to
1167 * be NOT defered and NOT externally accessible
1168 */
1169 LIST_FOREACH(fp, &filehead, f_list)
1170 fp->f_flag &= ~(FMARK|FDEFER);
1171 do {
1172 LIST_FOREACH(fp, &filehead, f_list) {
1173 /*
1174 * If the file is not open, skip it
1175 */
1176 if (fp->f_count == 0)
1177 continue;
1178 /*
1179 * If we already marked it as 'defer' in a
1180 * previous pass, then try process it this time
1181 * and un-mark it
1182 */
1183 if (fp->f_flag & FDEFER) {
1184 fp->f_flag &= ~FDEFER;
1185 unp_defer--;
1186 } else {
1187 /*
1188 * if it's not defered, then check if it's
1189 * already marked.. if so skip it
1190 */
1191 if (fp->f_flag & FMARK)
1192 continue;
1193 /*
1194 * If all references are from messages
1195 * in transit, then skip it. it's not
1196 * externally accessible.
1197 */
1198 if (fp->f_count == fp->f_msgcount)
1199 continue;
1200 /*
1201 * If it got this far then it must be
1202 * externally accessible.
1203 */
1204 fp->f_flag |= FMARK;
1205 }
1206 /*
1207 * either it was defered, or it is externally
1208 * accessible and not already marked so.
1209 * Now check if it is possibly one of OUR sockets.
1210 */
1211 if (fp->f_type != DTYPE_SOCKET ||
1212 (so = (struct socket *)fp->f_data) == 0)
1213 continue;
1214 if (so->so_proto->pr_domain != &localdomain ||
1215 (so->so_proto->pr_flags&PR_RIGHTS) == 0)
1216 continue;
1217#ifdef notdef
1218 if (so->so_rcv.sb_flags & SB_LOCK) {
1219 /*
1220 * This is problematical; it's not clear
1221 * we need to wait for the sockbuf to be
1222 * unlocked (on a uniprocessor, at least),
1223 * and it's also not clear what to do
1224 * if sbwait returns an error due to receipt
1225 * of a signal. If sbwait does return
1226 * an error, we'll go into an infinite
1227 * loop. Delete all of this for now.
1228 */
1229 (void) sbwait(&so->so_rcv);
1230 goto restart;
1231 }
1232#endif
1233 /*
1234 * So, Ok, it's one of our sockets and it IS externally
1235 * accessible (or was defered). Now we look
1236 * to see if we hold any file descriptors in its
1237 * message buffers. Follow those links and mark them
1238 * as accessible too.
1239 */
1240 unp_scan(so->so_rcv.sb_mb, unp_mark);
1241 }
1242 } while (unp_defer);
1243 /*
1244 * We grab an extra reference to each of the file table entries
1245 * that are not otherwise accessible and then free the rights
1246 * that are stored in messages on them.
1247 *
1248 * The bug in the orginal code is a little tricky, so I'll describe
1249 * what's wrong with it here.
1250 *
1251 * It is incorrect to simply unp_discard each entry for f_msgcount
1252 * times -- consider the case of sockets A and B that contain
1253 * references to each other. On a last close of some other socket,
1254 * we trigger a gc since the number of outstanding rights (unp_rights)
1255 * is non-zero. If during the sweep phase the gc code un_discards,
1256 * we end up doing a (full) closef on the descriptor. A closef on A
1257 * results in the following chain. Closef calls soo_close, which
1258 * calls soclose. Soclose calls first (through the switch
1259 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
1260 * returns because the previous instance had set unp_gcing, and
1261 * we return all the way back to soclose, which marks the socket
1262 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
1263 * to free up the rights that are queued in messages on the socket A,
1264 * i.e., the reference on B. The sorflush calls via the dom_dispose
1265 * switch unp_dispose, which unp_scans with unp_discard. This second
1266 * instance of unp_discard just calls closef on B.
1267 *
1268 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1269 * which results in another closef on A. Unfortunately, A is already
1270 * being closed, and the descriptor has already been marked with
1271 * SS_NOFDREF, and soclose panics at this point.
1272 *
1273 * Here, we first take an extra reference to each inaccessible
1274 * descriptor. Then, we call sorflush ourself, since we know
1275 * it is a Unix domain socket anyhow. After we destroy all the
1276 * rights carried in messages, we do a last closef to get rid
1277 * of our extra reference. This is the last close, and the
1278 * unp_detach etc will shut down the socket.
1279 *
1280 * 91/09/19, bsy@cs.cmu.edu
1281 */
1282 extra_ref = malloc(nfiles * sizeof(struct file *), M_FILE, M_WAITOK);
1283 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0;
1284 fp = nextfp) {
1285 nextfp = LIST_NEXT(fp, f_list);
1286 /*
1287 * If it's not open, skip it
1288 */
1289 if (fp->f_count == 0)
1290 continue;
1291 /*
1292 * If all refs are from msgs, and it's not marked accessible
1293 * then it must be referenced from some unreachable cycle
1294 * of (shut-down) FDs, so include it in our
1295 * list of FDs to remove
1296 */
1297 if (fp->f_count == fp->f_msgcount && !(fp->f_flag & FMARK)) {
1298 *fpp++ = fp;
1299 nunref++;
1300 fp->f_count++;
1301 }
1302 }
1303 /*
1304 * for each FD on our hit list, do the following two things
1305 */
1306 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
1307 struct file *tfp = *fpp;
1308 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL)
1309 sorflush((struct socket *)(tfp->f_data));
1310 }
1311 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
|
1311 closef(*fpp, (struct proc *) NULL);
| 1312 closef(*fpp, (struct thread *) NULL);
|
1312 free((caddr_t)extra_ref, M_FILE);
1313 unp_gcing = 0;
1314}
1315
1316void
1317unp_dispose(m)
1318 struct mbuf *m;
1319{
1320
1321 if (m)
1322 unp_scan(m, unp_discard);
1323}
1324
1325static int
1326unp_listen(unp, p)
1327 struct unpcb *unp;
1328 struct proc *p;
1329{
1330
1331 bzero(&unp->unp_peercred, sizeof(unp->unp_peercred));
1332 unp->unp_peercred.cr_uid = p->p_ucred->cr_uid;
1333 unp->unp_peercred.cr_ngroups = p->p_ucred->cr_ngroups;
1334 bcopy(p->p_ucred->cr_groups, unp->unp_peercred.cr_groups,
1335 sizeof(unp->unp_peercred.cr_groups));
1336 unp->unp_flags |= UNP_HAVEPCCACHED;
1337 return (0);
1338}
1339
1340static void
1341unp_scan(m0, op)
1342 register struct mbuf *m0;
1343 void (*op) __P((struct file *));
1344{
1345 register struct mbuf *m;
1346 register struct file **rp;
1347 register struct cmsghdr *cm;
1348 register int i;
1349 int qfds;
1350
1351 while (m0) {
1352 for (m = m0; m; m = m->m_next)
1353 if (m->m_type == MT_CONTROL &&
1354 m->m_len >= sizeof(*cm)) {
1355 cm = mtod(m, struct cmsghdr *);
1356 if (cm->cmsg_level != SOL_SOCKET ||
1357 cm->cmsg_type != SCM_RIGHTS)
1358 continue;
1359 qfds = (cm->cmsg_len -
1360 (CMSG_DATA(cm) - (u_char *)cm))
1361 / sizeof (struct file *);
1362 rp = (struct file **)CMSG_DATA(cm);
1363 for (i = 0; i < qfds; i++)
1364 (*op)(*rp++);
1365 break; /* XXX, but saves time */
1366 }
1367 m0 = m0->m_act;
1368 }
1369}
1370
1371static void
1372unp_mark(fp)
1373 struct file *fp;
1374{
1375
1376 if (fp->f_flag & FMARK)
1377 return;
1378 unp_defer++;
1379 fp->f_flag |= (FMARK|FDEFER);
1380}
1381
1382static void
1383unp_discard(fp)
1384 struct file *fp;
1385{
1386
1387 fp->f_msgcount--;
1388 unp_rights--;
| 1313 free((caddr_t)extra_ref, M_FILE);
1314 unp_gcing = 0;
1315}
1316
1317void
1318unp_dispose(m)
1319 struct mbuf *m;
1320{
1321
1322 if (m)
1323 unp_scan(m, unp_discard);
1324}
1325
1326static int
1327unp_listen(unp, p)
1328 struct unpcb *unp;
1329 struct proc *p;
1330{
1331
1332 bzero(&unp->unp_peercred, sizeof(unp->unp_peercred));
1333 unp->unp_peercred.cr_uid = p->p_ucred->cr_uid;
1334 unp->unp_peercred.cr_ngroups = p->p_ucred->cr_ngroups;
1335 bcopy(p->p_ucred->cr_groups, unp->unp_peercred.cr_groups,
1336 sizeof(unp->unp_peercred.cr_groups));
1337 unp->unp_flags |= UNP_HAVEPCCACHED;
1338 return (0);
1339}
1340
1341static void
1342unp_scan(m0, op)
1343 register struct mbuf *m0;
1344 void (*op) __P((struct file *));
1345{
1346 register struct mbuf *m;
1347 register struct file **rp;
1348 register struct cmsghdr *cm;
1349 register int i;
1350 int qfds;
1351
1352 while (m0) {
1353 for (m = m0; m; m = m->m_next)
1354 if (m->m_type == MT_CONTROL &&
1355 m->m_len >= sizeof(*cm)) {
1356 cm = mtod(m, struct cmsghdr *);
1357 if (cm->cmsg_level != SOL_SOCKET ||
1358 cm->cmsg_type != SCM_RIGHTS)
1359 continue;
1360 qfds = (cm->cmsg_len -
1361 (CMSG_DATA(cm) - (u_char *)cm))
1362 / sizeof (struct file *);
1363 rp = (struct file **)CMSG_DATA(cm);
1364 for (i = 0; i < qfds; i++)
1365 (*op)(*rp++);
1366 break; /* XXX, but saves time */
1367 }
1368 m0 = m0->m_act;
1369 }
1370}
1371
1372static void
1373unp_mark(fp)
1374 struct file *fp;
1375{
1376
1377 if (fp->f_flag & FMARK)
1378 return;
1379 unp_defer++;
1380 fp->f_flag |= (FMARK|FDEFER);
1381}
1382
1383static void
1384unp_discard(fp)
1385 struct file *fp;
1386{
1387
1388 fp->f_msgcount--;
1389 unp_rights--;
|
1389 (void) closef(fp, (struct proc *)NULL);
| 1390 (void) closef(fp, (struct thread *)NULL);
|
1390}
| 1391}
|