xref: /dragonfly/sys/kern/uipc_msg.c (revision 0cfebe3d) 
1 /*
2  * Copyright (c) 2003, 2004 Jeffrey M. Hsu.  All rights reserved.
3  * Copyright (c) 2003, 2004 The DragonFly Project.  All rights reserved.
4  *
5  * This code is derived from software contributed to The DragonFly Project
6  * by Jeffrey M. Hsu.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of The DragonFly Project nor the names of its
17  *    contributors may be used to endorse or promote products derived
18  *    from this software without specific, prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * $DragonFly: src/sys/kern/uipc_msg.c,v 1.20 2007/12/19 11:00:22 sephe Exp $
34  */
35 
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/msgport.h>
39 #include <sys/protosw.h>
40 #include <sys/socket.h>
41 #include <sys/socketvar.h>
42 #include <sys/socketops.h>
43 #include <sys/thread.h>
44 #include <sys/thread2.h>
45 #include <sys/msgport2.h>
46 #include <net/netmsg2.h>
47 
48 #include <net/netisr.h>
49 #include <net/netmsg.h>
50 
51 int
52 so_pru_abort(struct socket *so)
53 {
54 	int error;
55 	struct netmsg_pru_abort msg;
56 	lwkt_port_t port;
57 
58 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_ABORT);
59 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
60 		    netmsg_pru_abort);
61 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_abort;
62 	msg.nm_so = so;
63 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
64 	return (error);
65 }
66 
67 int
68 so_pru_accept(struct socket *so, struct sockaddr **nam)
69 {
70 	/* Block (memory allocation) in process context. XXX JH */
71 	return ((*so->so_proto->pr_usrreqs->pru_accept)(so, nam));
72 
73 #ifdef notdef
74 	int error;
75 	struct netmsg_pru_accept msg;
76 	lwkt_port_t port;
77 
78 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_ACCEPT);
79 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
80 		    netmsg_pru_accept);
81 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_accept;
82 	msg.nm_so = so;
83 	msg.nm_nam = nam;
84 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
85 	return (error);
86 #endif
87 }
88 
89 int
90 so_pru_attach(struct socket *so, int proto, struct pru_attach_info *ai)
91 {
92 	int error;
93 	struct netmsg_pru_attach msg;
94 	lwkt_port_t port;
95 
96 	port = so->so_proto->pr_mport(NULL, NULL, NULL, PRU_ATTACH);
97 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
98 		    netmsg_pru_attach);
99 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_attach;
100 	msg.nm_so = so;
101 	msg.nm_proto = proto;
102 	msg.nm_ai = ai;
103 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
104 	return (error);
105 }
106 
107 int
108 so_pru_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
109 {
110 	int error;
111 	struct netmsg_pru_bind msg;
112 	lwkt_port_t port;
113 
114 	/* Send mesg to thread for new address. */
115 	port = so->so_proto->pr_mport(NULL, nam, NULL, PRU_BIND);
116 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
117 		    netmsg_pru_bind);
118 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_bind;
119 	msg.nm_so = so;
120 	msg.nm_nam = nam;
121 	msg.nm_td = td;		/* used only for prison_ip() XXX JH */
122 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
123 	return (error);
124 }
125 
126 int
127 so_pru_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
128 {
129 	int error;
130 	struct netmsg_pru_connect msg;
131 	lwkt_port_t port;
132 
133 	port = so->so_proto->pr_mport(so, nam, NULL, PRU_CONNECT);
134 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
135 		    netmsg_pru_connect);
136 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_connect;
137 	msg.nm_so = so;
138 	msg.nm_nam = nam;
139 	msg.nm_td = td;
140 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
141 	return (error);
142 }
143 
144 int
145 so_pru_connect2(struct socket *so1, struct socket *so2)
146 {
147 	int error;
148 	struct netmsg_pru_connect2 msg;
149 	lwkt_port_t port;
150 
151 	port = so1->so_proto->pr_mport(so1, NULL, NULL, PRU_CONNECT2);
152 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
153 		    netmsg_pru_connect2);
154 	msg.nm_prufn = so1->so_proto->pr_usrreqs->pru_connect2;
155 	msg.nm_so1 = so1;
156 	msg.nm_so2 = so2;
157 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
158 	return (error);
159 }
160 
161 int
162 so_pru_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp)
163 {
164 	return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd, data, ifp,
165 	    curthread));
166 #ifdef gag	/* does copyin and copyout deep inside stack XXX JH */
167 	int error;
168 	struct netmsg_pru_control msg;
169 	lwkt_port_t port;
170 
171 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_CONTROL);
172 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
173 		    netmsg_pru_control);
174 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_control;
175 	msg.nm_so = so;
176 	msg.nm_cmd = cmd;
177 	msg.nm_data = data;
178 	msg.nm_ifp = ifp;
179 	msg.nm_td = td;
180 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
181 	return (error);
182 #endif
183 }
184 
185 int
186 so_pru_detach(struct socket *so)
187 {
188 	int error;
189 	struct netmsg_pru_detach msg;
190 	lwkt_port_t port;
191 
192 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_DETACH);
193 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
194 		    netmsg_pru_detach);
195 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_detach;
196 	msg.nm_so = so;
197 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
198 	return (error);
199 }
200 
201 int
202 so_pru_disconnect(struct socket *so)
203 {
204 	int error;
205 	struct netmsg_pru_disconnect msg;
206 	lwkt_port_t port;
207 
208 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_DISCONNECT);
209 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
210 		    netmsg_pru_disconnect);
211 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_disconnect;
212 	msg.nm_so = so;
213 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
214 	return (error);
215 }
216 
217 int
218 so_pru_listen(struct socket *so, struct thread *td)
219 {
220 	int error;
221 	struct netmsg_pru_listen msg;
222 	lwkt_port_t port;
223 
224 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_LISTEN);
225 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
226 		    netmsg_pru_listen);
227 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_listen;
228 	msg.nm_so = so;
229 	msg.nm_td = td;		/* used only for prison_ip() XXX JH */
230 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
231 	return (error);
232 }
233 
234 int
235 so_pru_peeraddr(struct socket *so, struct sockaddr **nam)
236 {
237 	int error;
238 	struct netmsg_pru_peeraddr msg;
239 	lwkt_port_t port;
240 
241 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_PEERADDR);
242 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
243 		    netmsg_pru_peeraddr);
244 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_peeraddr;
245 	msg.nm_so = so;
246 	msg.nm_nam = nam;
247 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
248 	return (error);
249 }
250 
251 int
252 so_pru_rcvd(struct socket *so, int flags)
253 {
254 	int error;
255 	struct netmsg_pru_rcvd msg;
256 	lwkt_port_t port;
257 
258 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_RCVD);
259 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
260 		    netmsg_pru_rcvd);
261 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_rcvd;
262 	msg.nm_so = so;
263 	msg.nm_flags = flags;
264 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
265 	return (error);
266 }
267 
268 int
269 so_pru_rcvoob(struct socket *so, struct mbuf *m, int flags)
270 {
271 	int error;
272 	struct netmsg_pru_rcvoob msg;
273 	lwkt_port_t port;
274 
275 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_RCVOOB);
276 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
277 		    netmsg_pru_rcvoob);
278 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_rcvoob;
279 	msg.nm_so = so;
280 	msg.nm_m = m;
281 	msg.nm_flags = flags;
282 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
283 	return (error);
284 }
285 
286 int
287 so_pru_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
288     struct mbuf *control, struct thread *td)
289 {
290 	int error;
291 	struct netmsg_pru_send msg;
292 	lwkt_port_t port;
293 
294 	port = so->so_proto->pr_mport(so, addr, &m, PRU_SEND);
295 	if (port == NULL) {
296 		KKASSERT(m == NULL);
297 		return EINVAL;
298 	}
299 
300 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
301 		    netmsg_pru_send);
302 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_send;
303 	msg.nm_so = so;
304 	msg.nm_flags = flags;
305 	msg.nm_m = m;
306 	msg.nm_addr = addr;
307 	msg.nm_control = control;
308 	msg.nm_td = td;
309 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
310 	return (error);
311 }
312 
313 int
314 so_pru_sense(struct socket *so, struct stat *sb)
315 {
316 	int error;
317 	struct netmsg_pru_sense msg;
318 	lwkt_port_t port;
319 
320 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_SENSE);
321 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
322 		    netmsg_pru_sense);
323 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sense;
324 	msg.nm_so = so;
325 	msg.nm_stat = sb;
326 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
327 	return (error);
328 }
329 
330 int
331 so_pru_shutdown(struct socket *so)
332 {
333 	int error;
334 	struct netmsg_pru_shutdown msg;
335 	lwkt_port_t port;
336 
337 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_SHUTDOWN);
338 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
339 		    netmsg_pru_shutdown);
340 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_shutdown;
341 	msg.nm_so = so;
342 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
343 	return (error);
344 }
345 
346 int
347 so_pru_sockaddr(struct socket *so, struct sockaddr **nam)
348 {
349 	int error;
350 	struct netmsg_pru_sockaddr msg;
351 	lwkt_port_t port;
352 
353 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_SOCKADDR);
354 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
355 		    netmsg_pru_sockaddr);
356 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sockaddr;
357 	msg.nm_so = so;
358 	msg.nm_nam = nam;
359 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
360 	return (error);
361 }
362 
363 int
364 so_pru_sopoll(struct socket *so, int events, struct ucred *cred)
365 {
366 	int error;
367 	struct netmsg_pru_sopoll msg;
368 	lwkt_port_t port;
369 
370 	port = so->so_proto->pr_mport(so, NULL, NULL, PRU_SOPOLL);
371 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
372 		    netmsg_pru_sopoll);
373 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sopoll;
374 	msg.nm_so = so;
375 	msg.nm_events = events;
376 	msg.nm_cred = cred;
377 	msg.nm_td = curthread;
378 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
379 	return (error);
380 }
381 
382 int
383 so_pr_ctloutput(struct socket *so, struct sockopt *sopt)
384 {
385 	return ((*so->so_proto->pr_ctloutput)(so, sopt));
386 #ifdef gag	/* does copyin and copyout deep inside stack XXX JH */
387 	struct netmsg_pr_ctloutput msg;
388 	lwkt_port_t port;
389 	int error;
390 
391 	port = so->so_proto->pr_mport(so, NULL);
392 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
393 		    netmsg_pru_ctloutput);
394 	msg.nm_prfn = so->so_proto->pr_ctloutput;
395 	msg.nm_so = so;
396 	msg.nm_sopt = sopt;
397 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
398 	return (error);
399 #endif
400 }
401 
402 /*
403  * If we convert all the protosw pr_ functions for all the protocols
404  * to take a message directly, this layer can go away.  For the moment
405  * our dispatcher ignores the return value, but since we are handling
406  * the replymsg ourselves we return EASYNC by convention.
407  */
408 void
409 netmsg_pru_abort(netmsg_t msg)
410 {
411 	struct netmsg_pru_abort *nm = (void *)msg;
412 
413 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
414 }
415 
416 #ifdef notused
417 void
418 netmsg_pru_accept(netmsg_t msg)
419 {
420 	struct netmsg_pru_accept *nm = (void *)msg;
421 
422 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
423 }
424 #endif
425 
426 void
427 netmsg_pru_attach(netmsg_t msg)
428 {
429 	struct netmsg_pru_attach *nm = (void *)msg;
430 
431 	lwkt_replymsg(&msg->nm_lmsg,
432 		      nm->nm_prufn(nm->nm_so, nm->nm_proto, nm->nm_ai));
433 }
434 
435 void
436 netmsg_pru_bind(netmsg_t msg)
437 {
438 	struct netmsg_pru_bind *nm = (void *)msg;
439 
440 	lwkt_replymsg(&msg->nm_lmsg,
441 		      nm->nm_prufn(nm->nm_so, nm->nm_nam, nm->nm_td));
442 }
443 
444 void
445 netmsg_pru_connect(netmsg_t msg)
446 {
447 	struct netmsg_pru_connect *nm = (void *)msg;
448 
449 	lwkt_replymsg(&msg->nm_lmsg,
450 		      nm->nm_prufn(nm->nm_so, nm->nm_nam, nm->nm_td));
451 }
452 
453 void
454 netmsg_pru_connect2(netmsg_t msg)
455 {
456 	struct netmsg_pru_connect2 *nm = (void *)msg;
457 
458 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so1, nm->nm_so2));
459 }
460 
461 void
462 netmsg_pru_control(netmsg_t msg)
463 {
464 	struct netmsg_pru_control *nm = (void *)msg;
465 	int error;
466 
467 	error = nm->nm_prufn(nm->nm_so, nm->nm_cmd, nm->nm_data,
468 				nm->nm_ifp, nm->nm_td);
469 	lwkt_replymsg(&msg->nm_lmsg, error);
470 }
471 
472 void
473 netmsg_pru_detach(netmsg_t msg)
474 {
475 	struct netmsg_pru_detach *nm = (void *)msg;
476 
477 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
478 }
479 
480 void
481 netmsg_pru_disconnect(netmsg_t msg)
482 {
483 	struct netmsg_pru_disconnect *nm = (void *)msg;
484 
485 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
486 }
487 
488 void
489 netmsg_pru_listen(netmsg_t msg)
490 {
491 	struct netmsg_pru_listen *nm = (void *)msg;
492 
493 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_td));
494 }
495 
496 void
497 netmsg_pru_peeraddr(netmsg_t msg)
498 {
499 	struct netmsg_pru_peeraddr *nm = (void *)msg;
500 
501 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
502 }
503 
504 void
505 netmsg_pru_rcvd(netmsg_t msg)
506 {
507 	struct netmsg_pru_rcvd *nm = (void *)msg;
508 
509 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_flags));
510 }
511 
512 void
513 netmsg_pru_rcvoob(netmsg_t msg)
514 {
515 	struct netmsg_pru_rcvoob *nm = (void *)msg;
516 
517 	lwkt_replymsg(&msg->nm_lmsg,
518 		      nm->nm_prufn(nm->nm_so, nm->nm_m, nm->nm_flags));
519 }
520 
521 void
522 netmsg_pru_send(netmsg_t msg)
523 {
524 	struct netmsg_pru_send *nm = (void *)msg;
525 	int error;
526 
527 	error = nm->nm_prufn(nm->nm_so, nm->nm_flags, nm->nm_m,
528 				nm->nm_addr, nm->nm_control, nm->nm_td);
529 	lwkt_replymsg(&msg->nm_lmsg, error);
530 }
531 
532 void
533 netmsg_pru_sense(netmsg_t msg)
534 {
535 	struct netmsg_pru_sense *nm = (void *)msg;
536 
537 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_stat));
538 }
539 
540 void
541 netmsg_pru_shutdown(netmsg_t msg)
542 {
543 	struct netmsg_pru_shutdown *nm = (void *)msg;
544 
545 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
546 }
547 
548 void
549 netmsg_pru_sockaddr(netmsg_t msg)
550 {
551 	struct netmsg_pru_sockaddr *nm = (void *)msg;
552 
553 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
554 }
555 
556 void
557 netmsg_pru_sopoll(netmsg_t msg)
558 {
559 	struct netmsg_pru_sopoll *nm = (void *)msg;
560 	int error;
561 
562 	error = nm->nm_prufn(nm->nm_so, nm->nm_events, nm->nm_cred, nm->nm_td);
563 	lwkt_replymsg(&msg->nm_lmsg, error);
564 }
565 
566 void
567 netmsg_pr_ctloutput(netmsg_t msg)
568 {
569 	struct netmsg_pr_ctloutput *nm = (void *)msg;
570 
571 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prfn(nm->nm_so, nm->nm_sopt));
572 }
573 
574 void
575 netmsg_pr_timeout(netmsg_t msg)
576 {
577 	struct netmsg_pr_timeout *nm = (void *)msg;
578 
579 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prfn());
580 }
581 
582 /*
583  * Handle a predicate event request.  This function is only called once
584  * when the predicate message queueing request is received.
585  */
586 void
587 netmsg_so_notify(netmsg_t netmsg)
588 {
589 	struct netmsg_so_notify *msg = (void *)netmsg;
590 	struct signalsockbuf *ssb;
591 
592 	ssb = (msg->nm_etype & NM_REVENT) ?
593 			&msg->nm_so->so_rcv :
594 			&msg->nm_so->so_snd;
595 
596 	/*
597 	 * Reply immediately if the event has occured, otherwise queue the
598 	 * request.
599 	 */
600 	if (msg->nm_predicate(&msg->nm_netmsg)) {
601 		lwkt_replymsg(&msg->nm_netmsg.nm_lmsg,
602 			      msg->nm_netmsg.nm_lmsg.ms_error);
603 	} else {
604 		TAILQ_INSERT_TAIL(&ssb->ssb_sel.si_mlist, msg, nm_list);
605 		ssb->ssb_flags |= SSB_MEVENT;
606 	}
607 }
608 
609 /*
610  * Called by doio when trying to abort a netmsg_so_notify message.
611  * Unlike the other functions this one is dispatched directly by
612  * the LWKT subsystem, so it takes a lwkt_msg_t as an argument.
613  *
614  * The original message, lmsg, is under the control of the caller and
615  * will not be destroyed until we return so we can safely reference it
616  * in our synchronous abort request.
617  *
618  * This part of the abort request occurs on the originating cpu which
619  * means we may race the message flags and the original message may
620  * not even have been processed by the target cpu yet.
621  */
622 void
623 netmsg_so_notify_doabort(lwkt_msg_t lmsg)
624 {
625 	struct netmsg_so_notify_abort msg;
626 
627 	if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
628 		netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
629 			    netmsg_so_notify_abort);
630 		msg.nm_notifymsg = (void *)lmsg;
631 		lwkt_domsg(lmsg->ms_target_port, &msg.nm_netmsg.nm_lmsg, 0);
632 	}
633 }
634 
635 /*
636  * Predicate requests can be aborted.  This function is only called once
637  * and will interlock against processing/reply races (since such races
638  * occur on the same thread that controls the port where the abort is
639  * requeued).
640  *
641  * This part of the abort request occurs on the target cpu.  The message
642  * flags must be tested again in case the test that we did on the
643  * originating cpu raced.  Since messages are handled in sequence, the
644  * original message will have already been handled by the loop and either
645  * replied to or queued.
646  *
647  * We really only need to interlock with MSGF_REPLY (a bit that is set on
648  * our cpu when we reply).  Note that MSGF_DONE is not set until the
649  * reply reaches the originating cpu.  Test both bits anyway.
650  */
651 void
652 netmsg_so_notify_abort(netmsg_t netmsg)
653 {
654 	struct netmsg_so_notify_abort *abrtmsg = (void *)netmsg;
655 	struct netmsg_so_notify *msg = abrtmsg->nm_notifymsg;
656 	struct signalsockbuf *ssb;
657 
658 	/*
659 	 * The original notify message is not destroyed until after the
660 	 * abort request is returned, so we can check its state.
661 	 */
662 	if ((msg->nm_netmsg.nm_lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
663 		ssb = (msg->nm_etype & NM_REVENT) ?
664 				&msg->nm_so->so_rcv :
665 				&msg->nm_so->so_snd;
666 		TAILQ_REMOVE(&ssb->ssb_sel.si_mlist, msg, nm_list);
667 		lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, EINTR);
668 	}
669 
670 	/*
671 	 * Reply to the abort message
672 	 */
673 	lwkt_replymsg(&abrtmsg->nm_netmsg.nm_lmsg, 0);
674 }
675 
676