xref: /dragonfly/sys/kern/uipc_msg.c (revision b7367ef6) 
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 1.19 2007/07/04 23:36:26 dillon 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, NULL, PRU_SEND);
295 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
296 		    netmsg_pru_send);
297 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_send;
298 	msg.nm_so = so;
299 	msg.nm_flags = flags;
300 	msg.nm_m = m;
301 	msg.nm_addr = addr;
302 	msg.nm_control = control;
303 	msg.nm_td = td;
304 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
305 	return (error);
306 }
307 
308 int
309 so_pru_sense(struct socket *so, struct stat *sb)
310 {
311 	int error;
312 	struct netmsg_pru_sense msg;
313 	lwkt_port_t port;
314 
315 	port = so->so_proto->pr_mport(so, NULL, PRU_SENSE);
316 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
317 		    netmsg_pru_sense);
318 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sense;
319 	msg.nm_so = so;
320 	msg.nm_stat = sb;
321 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
322 	return (error);
323 }
324 
325 int
326 so_pru_shutdown(struct socket *so)
327 {
328 	int error;
329 	struct netmsg_pru_shutdown msg;
330 	lwkt_port_t port;
331 
332 	port = so->so_proto->pr_mport(so, NULL, PRU_SHUTDOWN);
333 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
334 		    netmsg_pru_shutdown);
335 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_shutdown;
336 	msg.nm_so = so;
337 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
338 	return (error);
339 }
340 
341 int
342 so_pru_sockaddr(struct socket *so, struct sockaddr **nam)
343 {
344 	int error;
345 	struct netmsg_pru_sockaddr msg;
346 	lwkt_port_t port;
347 
348 	port = so->so_proto->pr_mport(so, NULL, PRU_SOCKADDR);
349 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
350 		    netmsg_pru_sockaddr);
351 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sockaddr;
352 	msg.nm_so = so;
353 	msg.nm_nam = nam;
354 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
355 	return (error);
356 }
357 
358 int
359 so_pru_sopoll(struct socket *so, int events, struct ucred *cred)
360 {
361 	int error;
362 	struct netmsg_pru_sopoll msg;
363 	lwkt_port_t port;
364 
365 	port = so->so_proto->pr_mport(so, NULL, PRU_SOPOLL);
366 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
367 		    netmsg_pru_sopoll);
368 	msg.nm_prufn = so->so_proto->pr_usrreqs->pru_sopoll;
369 	msg.nm_so = so;
370 	msg.nm_events = events;
371 	msg.nm_cred = cred;
372 	msg.nm_td = curthread;
373 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
374 	return (error);
375 }
376 
377 int
378 so_pr_ctloutput(struct socket *so, struct sockopt *sopt)
379 {
380 	return ((*so->so_proto->pr_ctloutput)(so, sopt));
381 #ifdef gag	/* does copyin and copyout deep inside stack XXX JH */
382 	struct netmsg_pr_ctloutput msg;
383 	lwkt_port_t port;
384 	int error;
385 
386 	port = so->so_proto->pr_mport(so, NULL);
387 	netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
388 		    netmsg_pru_ctloutput);
389 	msg.nm_prfn = so->so_proto->pr_ctloutput;
390 	msg.nm_so = so;
391 	msg.nm_sopt = sopt;
392 	error = lwkt_domsg(port, &msg.nm_netmsg.nm_lmsg, 0);
393 	return (error);
394 #endif
395 }
396 
397 /*
398  * If we convert all the protosw pr_ functions for all the protocols
399  * to take a message directly, this layer can go away.  For the moment
400  * our dispatcher ignores the return value, but since we are handling
401  * the replymsg ourselves we return EASYNC by convention.
402  */
403 void
404 netmsg_pru_abort(netmsg_t msg)
405 {
406 	struct netmsg_pru_abort *nm = (void *)msg;
407 
408 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
409 }
410 
411 #ifdef notused
412 void
413 netmsg_pru_accept(netmsg_t msg)
414 {
415 	struct netmsg_pru_accept *nm = (void *)msg;
416 
417 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
418 }
419 #endif
420 
421 void
422 netmsg_pru_attach(netmsg_t msg)
423 {
424 	struct netmsg_pru_attach *nm = (void *)msg;
425 
426 	lwkt_replymsg(&msg->nm_lmsg,
427 		      nm->nm_prufn(nm->nm_so, nm->nm_proto, nm->nm_ai));
428 }
429 
430 void
431 netmsg_pru_bind(netmsg_t msg)
432 {
433 	struct netmsg_pru_bind *nm = (void *)msg;
434 
435 	lwkt_replymsg(&msg->nm_lmsg,
436 		      nm->nm_prufn(nm->nm_so, nm->nm_nam, nm->nm_td));
437 }
438 
439 void
440 netmsg_pru_connect(netmsg_t msg)
441 {
442 	struct netmsg_pru_connect *nm = (void *)msg;
443 
444 	lwkt_replymsg(&msg->nm_lmsg,
445 		      nm->nm_prufn(nm->nm_so, nm->nm_nam, nm->nm_td));
446 }
447 
448 void
449 netmsg_pru_connect2(netmsg_t msg)
450 {
451 	struct netmsg_pru_connect2 *nm = (void *)msg;
452 
453 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so1, nm->nm_so2));
454 }
455 
456 void
457 netmsg_pru_control(netmsg_t msg)
458 {
459 	struct netmsg_pru_control *nm = (void *)msg;
460 	int error;
461 
462 	error = nm->nm_prufn(nm->nm_so, nm->nm_cmd, nm->nm_data,
463 				nm->nm_ifp, nm->nm_td);
464 	lwkt_replymsg(&msg->nm_lmsg, error);
465 }
466 
467 void
468 netmsg_pru_detach(netmsg_t msg)
469 {
470 	struct netmsg_pru_detach *nm = (void *)msg;
471 
472 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
473 }
474 
475 void
476 netmsg_pru_disconnect(netmsg_t msg)
477 {
478 	struct netmsg_pru_disconnect *nm = (void *)msg;
479 
480 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
481 }
482 
483 void
484 netmsg_pru_listen(netmsg_t msg)
485 {
486 	struct netmsg_pru_listen *nm = (void *)msg;
487 
488 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_td));
489 }
490 
491 void
492 netmsg_pru_peeraddr(netmsg_t msg)
493 {
494 	struct netmsg_pru_peeraddr *nm = (void *)msg;
495 
496 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
497 }
498 
499 void
500 netmsg_pru_rcvd(netmsg_t msg)
501 {
502 	struct netmsg_pru_rcvd *nm = (void *)msg;
503 
504 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_flags));
505 }
506 
507 void
508 netmsg_pru_rcvoob(netmsg_t msg)
509 {
510 	struct netmsg_pru_rcvoob *nm = (void *)msg;
511 
512 	lwkt_replymsg(&msg->nm_lmsg,
513 		      nm->nm_prufn(nm->nm_so, nm->nm_m, nm->nm_flags));
514 }
515 
516 void
517 netmsg_pru_send(netmsg_t msg)
518 {
519 	struct netmsg_pru_send *nm = (void *)msg;
520 	int error;
521 
522 	error = nm->nm_prufn(nm->nm_so, nm->nm_flags, nm->nm_m,
523 				nm->nm_addr, nm->nm_control, nm->nm_td);
524 	lwkt_replymsg(&msg->nm_lmsg, error);
525 }
526 
527 void
528 netmsg_pru_sense(netmsg_t msg)
529 {
530 	struct netmsg_pru_sense *nm = (void *)msg;
531 
532 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_stat));
533 }
534 
535 void
536 netmsg_pru_shutdown(netmsg_t msg)
537 {
538 	struct netmsg_pru_shutdown *nm = (void *)msg;
539 
540 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so));
541 }
542 
543 void
544 netmsg_pru_sockaddr(netmsg_t msg)
545 {
546 	struct netmsg_pru_sockaddr *nm = (void *)msg;
547 
548 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prufn(nm->nm_so, nm->nm_nam));
549 }
550 
551 void
552 netmsg_pru_sopoll(netmsg_t msg)
553 {
554 	struct netmsg_pru_sopoll *nm = (void *)msg;
555 	int error;
556 
557 	error = nm->nm_prufn(nm->nm_so, nm->nm_events, nm->nm_cred, nm->nm_td);
558 	lwkt_replymsg(&msg->nm_lmsg, error);
559 }
560 
561 void
562 netmsg_pr_ctloutput(netmsg_t msg)
563 {
564 	struct netmsg_pr_ctloutput *nm = (void *)msg;
565 
566 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prfn(nm->nm_so, nm->nm_sopt));
567 }
568 
569 void
570 netmsg_pr_timeout(netmsg_t msg)
571 {
572 	struct netmsg_pr_timeout *nm = (void *)msg;
573 
574 	lwkt_replymsg(&msg->nm_lmsg, nm->nm_prfn());
575 }
576 
577 /*
578  * Handle a predicate event request.  This function is only called once
579  * when the predicate message queueing request is received.
580  */
581 void
582 netmsg_so_notify(netmsg_t netmsg)
583 {
584 	struct netmsg_so_notify *msg = (void *)netmsg;
585 	struct signalsockbuf *ssb;
586 
587 	ssb = (msg->nm_etype & NM_REVENT) ?
588 			&msg->nm_so->so_rcv :
589 			&msg->nm_so->so_snd;
590 
591 	/*
592 	 * Reply immediately if the event has occured, otherwise queue the
593 	 * request.
594 	 */
595 	if (msg->nm_predicate(&msg->nm_netmsg)) {
596 		lwkt_replymsg(&msg->nm_netmsg.nm_lmsg,
597 			      msg->nm_netmsg.nm_lmsg.ms_error);
598 	} else {
599 		TAILQ_INSERT_TAIL(&ssb->ssb_sel.si_mlist, msg, nm_list);
600 		ssb->ssb_flags |= SSB_MEVENT;
601 	}
602 }
603 
604 /*
605  * Called by doio when trying to abort a netmsg_so_notify message.
606  * Unlike the other functions this one is dispatched directly by
607  * the LWKT subsystem, so it takes a lwkt_msg_t as an argument.
608  *
609  * The original message, lmsg, is under the control of the caller and
610  * will not be destroyed until we return so we can safely reference it
611  * in our synchronous abort request.
612  *
613  * This part of the abort request occurs on the originating cpu which
614  * means we may race the message flags and the original message may
615  * not even have been processed by the target cpu yet.
616  */
617 void
618 netmsg_so_notify_doabort(lwkt_msg_t lmsg)
619 {
620 	struct netmsg_so_notify_abort msg;
621 
622 	if ((lmsg->ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
623 		netmsg_init(&msg.nm_netmsg, &curthread->td_msgport, 0,
624 			    netmsg_so_notify_abort);
625 		msg.nm_notifymsg = (void *)lmsg;
626 		lwkt_domsg(lmsg->ms_target_port, &msg.nm_netmsg.nm_lmsg, 0);
627 	}
628 }
629 
630 /*
631  * Predicate requests can be aborted.  This function is only called once
632  * and will interlock against processing/reply races (since such races
633  * occur on the same thread that controls the port where the abort is
634  * requeued).
635  *
636  * This part of the abort request occurs on the target cpu.  The message
637  * flags must be tested again in case the test that we did on the
638  * originating cpu raced.  Since messages are handled in sequence, the
639  * original message will have already been handled by the loop and either
640  * replied to or queued.
641  *
642  * We really only need to interlock with MSGF_REPLY (a bit that is set on
643  * our cpu when we reply).  Note that MSGF_DONE is not set until the
644  * reply reaches the originating cpu.  Test both bits anyway.
645  */
646 void
647 netmsg_so_notify_abort(netmsg_t netmsg)
648 {
649 	struct netmsg_so_notify_abort *abrtmsg = (void *)netmsg;
650 	struct netmsg_so_notify *msg = abrtmsg->nm_notifymsg;
651 	struct signalsockbuf *ssb;
652 
653 	/*
654 	 * The original notify message is not destroyed until after the
655 	 * abort request is returned, so we can check its state.
656 	 */
657 	if ((msg->nm_netmsg.nm_lmsg.ms_flags & (MSGF_DONE | MSGF_REPLY)) == 0) {
658 		ssb = (msg->nm_etype & NM_REVENT) ?
659 				&msg->nm_so->so_rcv :
660 				&msg->nm_so->so_snd;
661 		TAILQ_REMOVE(&ssb->ssb_sel.si_mlist, msg, nm_list);
662 		lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, EINTR);
663 	}
664 
665 	/*
666 	 * Reply to the abort message
667 	 */
668 	lwkt_replymsg(&abrtmsg->nm_netmsg.nm_lmsg, 0);
669 }
670 
671