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