1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/aio.h>
35 #include <sys/domain.h>
36 #include <sys/file.h>
37 #include <sys/filedesc.h>
38 #include <sys/kernel.h>
39 #include <sys/kthread.h>
40 #include <sys/malloc.h>
41 #include <sys/proc.h>
42 #include <sys/protosw.h>
43 #include <sys/sigio.h>
44 #include <sys/signal.h>
45 #include <sys/signalvar.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/filio.h> /* XXX */
49 #include <sys/sockio.h>
50 #include <sys/stat.h>
51 #include <sys/sysctl.h>
52 #include <sys/sysproto.h>
53 #include <sys/taskqueue.h>
54 #include <sys/uio.h>
55 #include <sys/ucred.h>
56 #include <sys/un.h>
57 #include <sys/unpcb.h>
58 #include <sys/user.h>
59
60 #include <net/if.h>
61 #include <net/if_var.h>
62 #include <net/route.h>
63 #include <net/vnet.h>
64
65 #include <netinet/in.h>
66 #include <netinet/in_pcb.h>
67
68 #include <security/mac/mac_framework.h>
69
70 #include <vm/vm.h>
71 #include <vm/pmap.h>
72 #include <vm/vm_extern.h>
73 #include <vm/vm_map.h>
74
75 static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
76 "socket AIO stats");
77
78 static int empty_results;
79 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results,
80 0, "socket operation returned EAGAIN");
81
82 static int empty_retries;
83 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries,
84 0, "socket operation retries");
85
86 static fo_rdwr_t soo_read;
87 static fo_rdwr_t soo_write;
88 static fo_ioctl_t soo_ioctl;
89 static fo_poll_t soo_poll;
90 extern fo_kqfilter_t soo_kqfilter;
91 static fo_stat_t soo_stat;
92 static fo_close_t soo_close;
93 static fo_fill_kinfo_t soo_fill_kinfo;
94 static fo_aio_queue_t soo_aio_queue;
95
96 static void soo_aio_cancel(struct kaiocb *job);
97
98 struct fileops socketops = {
99 .fo_read = soo_read,
100 .fo_write = soo_write,
101 .fo_truncate = invfo_truncate,
102 .fo_ioctl = soo_ioctl,
103 .fo_poll = soo_poll,
104 .fo_kqfilter = soo_kqfilter,
105 .fo_stat = soo_stat,
106 .fo_close = soo_close,
107 .fo_chmod = invfo_chmod,
108 .fo_chown = invfo_chown,
109 .fo_sendfile = invfo_sendfile,
110 .fo_fill_kinfo = soo_fill_kinfo,
111 .fo_aio_queue = soo_aio_queue,
112 .fo_cmp = file_kcmp_generic,
113 .fo_flags = DFLAG_PASSABLE
114 };
115
116 static int
soo_read(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)117 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
118 int flags, struct thread *td)
119 {
120 struct socket *so = fp->f_data;
121 int error;
122
123 #ifdef MAC
124 error = mac_socket_check_receive(active_cred, so);
125 if (error)
126 return (error);
127 #endif
128 error = soreceive(so, 0, uio, 0, 0, 0);
129 return (error);
130 }
131
132 static int
soo_write(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)133 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
134 int flags, struct thread *td)
135 {
136 struct socket *so = fp->f_data;
137 int error;
138
139 #ifdef MAC
140 error = mac_socket_check_send(active_cred, so);
141 if (error)
142 return (error);
143 #endif
144 error = sousrsend(so, NULL, uio, NULL, 0, NULL);
145 return (error);
146 }
147
148 static int
soo_ioctl(struct file * fp,u_long cmd,void * data,struct ucred * active_cred,struct thread * td)149 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
150 struct thread *td)
151 {
152 struct socket *so = fp->f_data;
153 int error = 0;
154
155 switch (cmd) {
156 case FIONBIO:
157 SOCK_LOCK(so);
158 if (*(int *)data)
159 so->so_state |= SS_NBIO;
160 else
161 so->so_state &= ~SS_NBIO;
162 SOCK_UNLOCK(so);
163 break;
164
165 case FIOASYNC:
166 if (*(int *)data) {
167 SOCK_LOCK(so);
168 so->so_state |= SS_ASYNC;
169 if (SOLISTENING(so)) {
170 so->sol_sbrcv_flags |= SB_ASYNC;
171 so->sol_sbsnd_flags |= SB_ASYNC;
172 } else {
173 SOCK_RECVBUF_LOCK(so);
174 so->so_rcv.sb_flags |= SB_ASYNC;
175 SOCK_RECVBUF_UNLOCK(so);
176 SOCK_SENDBUF_LOCK(so);
177 so->so_snd.sb_flags |= SB_ASYNC;
178 SOCK_SENDBUF_UNLOCK(so);
179 }
180 SOCK_UNLOCK(so);
181 } else {
182 SOCK_LOCK(so);
183 so->so_state &= ~SS_ASYNC;
184 if (SOLISTENING(so)) {
185 so->sol_sbrcv_flags &= ~SB_ASYNC;
186 so->sol_sbsnd_flags &= ~SB_ASYNC;
187 } else {
188 SOCK_RECVBUF_LOCK(so);
189 so->so_rcv.sb_flags &= ~SB_ASYNC;
190 SOCK_RECVBUF_UNLOCK(so);
191 SOCK_SENDBUF_LOCK(so);
192 so->so_snd.sb_flags &= ~SB_ASYNC;
193 SOCK_SENDBUF_UNLOCK(so);
194 }
195 SOCK_UNLOCK(so);
196 }
197 break;
198
199 case FIONREAD:
200 SOCK_RECVBUF_LOCK(so);
201 if (SOLISTENING(so)) {
202 error = EINVAL;
203 } else {
204 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl;
205 }
206 SOCK_RECVBUF_UNLOCK(so);
207 break;
208
209 case FIONWRITE:
210 /* Unlocked read. */
211 if (SOLISTENING(so)) {
212 error = EINVAL;
213 } else {
214 *(int *)data = sbavail(&so->so_snd);
215 }
216 break;
217
218 case FIONSPACE:
219 /* Unlocked read. */
220 if (SOLISTENING(so)) {
221 error = EINVAL;
222 } else {
223 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) ||
224 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) {
225 *(int *)data = 0;
226 } else {
227 *(int *)data = sbspace(&so->so_snd);
228 }
229 }
230 break;
231
232 case FIOSETOWN:
233 error = fsetown(*(int *)data, &so->so_sigio);
234 break;
235
236 case FIOGETOWN:
237 *(int *)data = fgetown(&so->so_sigio);
238 break;
239
240 case SIOCSPGRP:
241 error = fsetown(-(*(int *)data), &so->so_sigio);
242 break;
243
244 case SIOCGPGRP:
245 *(int *)data = -fgetown(&so->so_sigio);
246 break;
247
248 case SIOCATMARK:
249 /* Unlocked read. */
250 if (SOLISTENING(so)) {
251 error = EINVAL;
252 } else {
253 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
254 }
255 break;
256 default:
257 /*
258 * Interface/routing/protocol specific ioctls: interface and
259 * routing ioctls should have a different entry since a
260 * socket is unnecessary.
261 */
262 if (IOCGROUP(cmd) == 'i')
263 error = ifioctl(so, cmd, data, td);
264 else if (IOCGROUP(cmd) == 'r') {
265 CURVNET_SET(so->so_vnet);
266 error = rtioctl_fib(cmd, data, so->so_fibnum);
267 CURVNET_RESTORE();
268 } else {
269 CURVNET_SET(so->so_vnet);
270 error = so->so_proto->pr_control(so, cmd, data, 0, td);
271 CURVNET_RESTORE();
272 }
273 break;
274 }
275 return (error);
276 }
277
278 static int
soo_poll(struct file * fp,int events,struct ucred * active_cred,struct thread * td)279 soo_poll(struct file *fp, int events, struct ucred *active_cred,
280 struct thread *td)
281 {
282 struct socket *so = fp->f_data;
283 #ifdef MAC
284 int error;
285
286 error = mac_socket_check_poll(active_cred, so);
287 if (error)
288 return (error);
289 #endif
290 return (sopoll(so, events, fp->f_cred, td));
291 }
292
293 static int
soo_stat(struct file * fp,struct stat * ub,struct ucred * active_cred)294 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred)
295 {
296 struct socket *so = fp->f_data;
297 int error = 0;
298
299 bzero((caddr_t)ub, sizeof (*ub));
300 ub->st_mode = S_IFSOCK;
301 #ifdef MAC
302 error = mac_socket_check_stat(active_cred, so);
303 if (error)
304 return (error);
305 #endif
306 SOCK_LOCK(so);
307 if (!SOLISTENING(so)) {
308 struct sockbuf *sb;
309
310 /*
311 * If SBS_CANTRCVMORE is set, but there's still data left
312 * in the receive buffer, the socket is still readable.
313 */
314 sb = &so->so_rcv;
315 SOCK_RECVBUF_LOCK(so);
316 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb))
317 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
318 ub->st_size = sbavail(sb) - sb->sb_ctl;
319 SOCK_RECVBUF_UNLOCK(so);
320
321 sb = &so->so_snd;
322 SOCK_SENDBUF_LOCK(so);
323 if ((sb->sb_state & SBS_CANTSENDMORE) == 0)
324 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
325 SOCK_SENDBUF_UNLOCK(so);
326 }
327 ub->st_uid = so->so_cred->cr_uid;
328 ub->st_gid = so->so_cred->cr_gid;
329 if (so->so_proto->pr_sense)
330 error = so->so_proto->pr_sense(so, ub);
331 SOCK_UNLOCK(so);
332 return (error);
333 }
334
335 /*
336 * API socket close on file pointer. We call soclose() to close the socket
337 * (including initiating closing protocols). soclose() will sorele() the
338 * file reference but the actual socket will not go away until the socket's
339 * ref count hits 0.
340 */
341 static int
soo_close(struct file * fp,struct thread * td)342 soo_close(struct file *fp, struct thread *td)
343 {
344 int error = 0;
345 struct socket *so;
346
347 so = fp->f_data;
348 fp->f_ops = &badfileops;
349 fp->f_data = NULL;
350
351 if (so)
352 error = soclose(so);
353 return (error);
354 }
355
356 static int
soo_fill_kinfo(struct file * fp,struct kinfo_file * kif,struct filedesc * fdp)357 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
358 {
359 struct sockaddr_storage ss = { .ss_len = sizeof(ss) };
360 struct unpcb *unpcb;
361 struct socket *so;
362 int error;
363
364 kif->kf_type = KF_TYPE_SOCKET;
365 so = fp->f_data;
366 CURVNET_SET(so->so_vnet);
367 kif->kf_un.kf_sock.kf_sock_domain0 =
368 so->so_proto->pr_domain->dom_family;
369 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type;
370 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol;
371 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb;
372 switch (kif->kf_un.kf_sock.kf_sock_domain0) {
373 case AF_INET:
374 case AF_INET6:
375 /* XXX: kf_sock_inpcb is obsolete. It may be removed. */
376 kif->kf_un.kf_sock.kf_sock_inpcb = (uintptr_t)so->so_pcb;
377 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
378 so->so_rcv.sb_state;
379 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
380 so->so_snd.sb_state;
381 kif->kf_un.kf_sock.kf_sock_sendq =
382 sbused(&so->so_snd);
383 kif->kf_un.kf_sock.kf_sock_recvq =
384 sbused(&so->so_rcv);
385 break;
386 case AF_UNIX:
387 if (so->so_pcb != NULL) {
388 unpcb = (struct unpcb *)(so->so_pcb);
389 if (unpcb->unp_conn) {
390 kif->kf_un.kf_sock.kf_sock_unpconn =
391 (uintptr_t)unpcb->unp_conn;
392 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
393 so->so_rcv.sb_state;
394 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
395 so->so_snd.sb_state;
396 kif->kf_un.kf_sock.kf_sock_sendq =
397 sbused(&so->so_snd);
398 kif->kf_un.kf_sock.kf_sock_recvq =
399 sbused(&so->so_rcv);
400 }
401 }
402 break;
403 }
404 error = sosockaddr(so, (struct sockaddr *)&ss);
405 if (error == 0 &&
406 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) {
407 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_local, ss.ss_len);
408 }
409 ss.ss_len = sizeof(ss);
410 error = sopeeraddr(so, (struct sockaddr *)&ss);
411 if (error == 0 &&
412 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) {
413 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_peer, ss.ss_len);
414 }
415 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name,
416 sizeof(kif->kf_path));
417 CURVNET_RESTORE();
418 return (0);
419 }
420
421 /*
422 * Use the 'backend3' field in AIO jobs to store the amount of data
423 * completed by the AIO job so far.
424 */
425 #define aio_done backend3
426
427 static STAILQ_HEAD(, task) soaio_jobs;
428 static struct mtx soaio_jobs_lock;
429 static struct task soaio_kproc_task;
430 static int soaio_starting, soaio_idle, soaio_queued;
431 static struct unrhdr *soaio_kproc_unr;
432
433 static int soaio_max_procs = MAX_AIO_PROCS;
434 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0,
435 "Maximum number of kernel processes to use for async socket IO");
436
437 static int soaio_num_procs;
438 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0,
439 "Number of active kernel processes for async socket IO");
440
441 static int soaio_target_procs = TARGET_AIO_PROCS;
442 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD,
443 &soaio_target_procs, 0,
444 "Preferred number of ready kernel processes for async socket IO");
445
446 static int soaio_lifetime;
447 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0,
448 "Maximum lifetime for idle aiod");
449
450 static void
soaio_kproc_loop(void * arg)451 soaio_kproc_loop(void *arg)
452 {
453 struct proc *p;
454 struct vmspace *myvm;
455 struct task *task;
456 int error, id, pending;
457
458 id = (intptr_t)arg;
459
460 /*
461 * Grab an extra reference on the daemon's vmspace so that it
462 * doesn't get freed by jobs that switch to a different
463 * vmspace.
464 */
465 p = curproc;
466 myvm = vmspace_acquire_ref(p);
467
468 mtx_lock(&soaio_jobs_lock);
469 MPASS(soaio_starting > 0);
470 soaio_starting--;
471 for (;;) {
472 while (!STAILQ_EMPTY(&soaio_jobs)) {
473 task = STAILQ_FIRST(&soaio_jobs);
474 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link);
475 soaio_queued--;
476 pending = task->ta_pending;
477 task->ta_pending = 0;
478 mtx_unlock(&soaio_jobs_lock);
479
480 task->ta_func(task->ta_context, pending);
481
482 mtx_lock(&soaio_jobs_lock);
483 }
484 MPASS(soaio_queued == 0);
485
486 if (p->p_vmspace != myvm) {
487 mtx_unlock(&soaio_jobs_lock);
488 vmspace_switch_aio(myvm);
489 mtx_lock(&soaio_jobs_lock);
490 continue;
491 }
492
493 soaio_idle++;
494 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-",
495 soaio_lifetime);
496 soaio_idle--;
497 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) &&
498 soaio_num_procs > soaio_target_procs)
499 break;
500 }
501 soaio_num_procs--;
502 mtx_unlock(&soaio_jobs_lock);
503 free_unr(soaio_kproc_unr, id);
504 kproc_exit(0);
505 }
506
507 static void
soaio_kproc_create(void * context,int pending)508 soaio_kproc_create(void *context, int pending)
509 {
510 struct proc *p;
511 int error, id;
512
513 mtx_lock(&soaio_jobs_lock);
514 for (;;) {
515 if (soaio_num_procs < soaio_target_procs) {
516 /* Must create */
517 } else if (soaio_num_procs >= soaio_max_procs) {
518 /*
519 * Hit the limit on kernel processes, don't
520 * create another one.
521 */
522 break;
523 } else if (soaio_queued <= soaio_idle + soaio_starting) {
524 /*
525 * No more AIO jobs waiting for a process to be
526 * created, so stop.
527 */
528 break;
529 }
530 soaio_starting++;
531 mtx_unlock(&soaio_jobs_lock);
532
533 id = alloc_unr(soaio_kproc_unr);
534 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id,
535 &p, 0, 0, "soaiod%d", id);
536 if (error != 0) {
537 free_unr(soaio_kproc_unr, id);
538 mtx_lock(&soaio_jobs_lock);
539 soaio_starting--;
540 break;
541 }
542
543 mtx_lock(&soaio_jobs_lock);
544 soaio_num_procs++;
545 }
546 mtx_unlock(&soaio_jobs_lock);
547 }
548
549 void
soaio_enqueue(struct task * task)550 soaio_enqueue(struct task *task)
551 {
552
553 mtx_lock(&soaio_jobs_lock);
554 MPASS(task->ta_pending == 0);
555 task->ta_pending++;
556 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link);
557 soaio_queued++;
558 if (soaio_queued <= soaio_idle)
559 wakeup_one(&soaio_idle);
560 else if (soaio_num_procs < soaio_max_procs)
561 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task);
562 mtx_unlock(&soaio_jobs_lock);
563 }
564
565 static void
soaio_init(void)566 soaio_init(void)
567 {
568
569 soaio_lifetime = AIOD_LIFETIME_DEFAULT;
570 STAILQ_INIT(&soaio_jobs);
571 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF);
572 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL);
573 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL);
574 }
575 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL);
576
577 static __inline int
soaio_ready(struct socket * so,struct sockbuf * sb)578 soaio_ready(struct socket *so, struct sockbuf *sb)
579 {
580 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so));
581 }
582
583 static void
soaio_process_job(struct socket * so,sb_which which,struct kaiocb * job)584 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job)
585 {
586 struct ucred *td_savedcred;
587 struct thread *td;
588 struct sockbuf *sb = sobuf(so, which);
589 #ifdef MAC
590 struct file *fp = job->fd_file;
591 #endif
592 size_t cnt, done, job_total_nbytes __diagused;
593 long ru_before;
594 int error, flags;
595
596 SOCK_BUF_UNLOCK(so, which);
597 aio_switch_vmspace(job);
598 td = curthread;
599 retry:
600 td_savedcred = td->td_ucred;
601 td->td_ucred = job->cred;
602
603 job_total_nbytes = job->uiop->uio_resid + job->aio_done;
604 done = job->aio_done;
605 cnt = job->uiop->uio_resid;
606 job->uiop->uio_offset = 0;
607 job->uiop->uio_td = td;
608 flags = MSG_NBIO;
609
610 /*
611 * For resource usage accounting, only count a completed request
612 * as a single message to avoid counting multiple calls to
613 * sosend/soreceive on a blocking socket.
614 */
615
616 if (sb == &so->so_rcv) {
617 ru_before = td->td_ru.ru_msgrcv;
618 #ifdef MAC
619 error = mac_socket_check_receive(fp->f_cred, so);
620 if (error == 0)
621
622 #endif
623 error = soreceive(so, NULL, job->uiop, NULL, NULL,
624 &flags);
625 if (td->td_ru.ru_msgrcv != ru_before)
626 job->msgrcv = 1;
627 } else {
628 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
629 flags |= MSG_MORETOCOME;
630 ru_before = td->td_ru.ru_msgsnd;
631 #ifdef MAC
632 error = mac_socket_check_send(fp->f_cred, so);
633 if (error == 0)
634 #endif
635 error = sousrsend(so, NULL, job->uiop, NULL, flags,
636 job->userproc);
637 if (td->td_ru.ru_msgsnd != ru_before)
638 job->msgsnd = 1;
639 }
640
641 done += cnt - job->uiop->uio_resid;
642 job->aio_done = done;
643 td->td_ucred = td_savedcred;
644
645 if (error == EWOULDBLOCK) {
646 /*
647 * The request was either partially completed or not
648 * completed at all due to racing with a read() or
649 * write() on the socket. If the socket is
650 * non-blocking, return with any partial completion.
651 * If the socket is blocking or if no progress has
652 * been made, requeue this request at the head of the
653 * queue to try again when the socket is ready.
654 */
655 MPASS(done != job_total_nbytes);
656 SOCK_BUF_LOCK(so, which);
657 if (done == 0 || !(so->so_state & SS_NBIO)) {
658 empty_results++;
659 if (soaio_ready(so, sb)) {
660 empty_retries++;
661 SOCK_BUF_UNLOCK(so, which);
662 goto retry;
663 }
664
665 if (!aio_set_cancel_function(job, soo_aio_cancel)) {
666 SOCK_BUF_UNLOCK(so, which);
667 if (done != 0)
668 aio_complete(job, done, 0);
669 else
670 aio_cancel(job);
671 SOCK_BUF_LOCK(so, which);
672 } else {
673 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list);
674 }
675 return;
676 }
677 SOCK_BUF_UNLOCK(so, which);
678 }
679 if (done != 0 && (error == ERESTART || error == EINTR ||
680 error == EWOULDBLOCK))
681 error = 0;
682 if (error)
683 aio_complete(job, -1, error);
684 else
685 aio_complete(job, done, 0);
686 SOCK_BUF_LOCK(so, which);
687 }
688
689 static void
soaio_process_sb(struct socket * so,sb_which which)690 soaio_process_sb(struct socket *so, sb_which which)
691 {
692 struct kaiocb *job;
693 struct sockbuf *sb = sobuf(so, which);
694
695 CURVNET_SET(so->so_vnet);
696 SOCK_BUF_LOCK(so, which);
697 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) {
698 job = TAILQ_FIRST(&sb->sb_aiojobq);
699 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
700 if (!aio_clear_cancel_function(job))
701 continue;
702
703 soaio_process_job(so, which, job);
704 }
705
706 /*
707 * If there are still pending requests, the socket must not be
708 * ready so set SB_AIO to request a wakeup when the socket
709 * becomes ready.
710 */
711 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
712 sb->sb_flags |= SB_AIO;
713 sb->sb_flags &= ~SB_AIO_RUNNING;
714 SOCK_BUF_UNLOCK(so, which);
715
716 sorele(so);
717 CURVNET_RESTORE();
718 }
719
720 void
soaio_rcv(void * context,int pending)721 soaio_rcv(void *context, int pending)
722 {
723 struct socket *so;
724
725 so = context;
726 soaio_process_sb(so, SO_RCV);
727 }
728
729 void
soaio_snd(void * context,int pending)730 soaio_snd(void *context, int pending)
731 {
732 struct socket *so;
733
734 so = context;
735 soaio_process_sb(so, SO_SND);
736 }
737
738 void
sowakeup_aio(struct socket * so,sb_which which)739 sowakeup_aio(struct socket *so, sb_which which)
740 {
741 struct sockbuf *sb = sobuf(so, which);
742
743 SOCK_BUF_LOCK_ASSERT(so, which);
744
745 sb->sb_flags &= ~SB_AIO;
746 if (sb->sb_flags & SB_AIO_RUNNING)
747 return;
748 sb->sb_flags |= SB_AIO_RUNNING;
749 soref(so);
750 soaio_enqueue(&sb->sb_aiotask);
751 }
752
753 static void
soo_aio_cancel(struct kaiocb * job)754 soo_aio_cancel(struct kaiocb *job)
755 {
756 struct socket *so;
757 struct sockbuf *sb;
758 long done;
759 int opcode;
760 sb_which which;
761
762 so = job->fd_file->f_data;
763 opcode = job->uaiocb.aio_lio_opcode;
764 if (opcode & LIO_READ) {
765 sb = &so->so_rcv;
766 which = SO_RCV;
767 } else {
768 MPASS(opcode & LIO_WRITE);
769 sb = &so->so_snd;
770 which = SO_SND;
771 }
772
773 SOCK_BUF_LOCK(so, which);
774 if (!aio_cancel_cleared(job))
775 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
776 if (TAILQ_EMPTY(&sb->sb_aiojobq))
777 sb->sb_flags &= ~SB_AIO;
778 SOCK_BUF_UNLOCK(so, which);
779
780 done = job->aio_done;
781 if (done != 0)
782 aio_complete(job, done, 0);
783 else
784 aio_cancel(job);
785 }
786
787 static int
soo_aio_queue(struct file * fp,struct kaiocb * job)788 soo_aio_queue(struct file *fp, struct kaiocb *job)
789 {
790 struct socket *so;
791 struct sockbuf *sb;
792 sb_which which;
793 int error;
794
795 so = fp->f_data;
796 error = so->so_proto->pr_aio_queue(so, job);
797 if (error == 0)
798 return (0);
799
800 /* Lock through the socket, since this may be a listening socket. */
801 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) {
802 case LIO_READ:
803 SOCK_RECVBUF_LOCK(so);
804 sb = &so->so_rcv;
805 which = SO_RCV;
806 break;
807 case LIO_WRITE:
808 SOCK_SENDBUF_LOCK(so);
809 sb = &so->so_snd;
810 which = SO_SND;
811 break;
812 default:
813 return (EINVAL);
814 }
815
816 if (SOLISTENING(so)) {
817 SOCK_BUF_UNLOCK(so, which);
818 return (EINVAL);
819 }
820
821 if (!aio_set_cancel_function(job, soo_aio_cancel))
822 panic("new job was cancelled");
823 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list);
824 if (!(sb->sb_flags & SB_AIO_RUNNING)) {
825 if (soaio_ready(so, sb))
826 sowakeup_aio(so, which);
827 else
828 sb->sb_flags |= SB_AIO;
829 }
830 SOCK_BUF_UNLOCK(so, which);
831 return (0);
832 }
833