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 static fo_kqfilter_t soo_kqfilter;
91 static fo_stat_t soo_stat;
92 static fo_close_t soo_close;
93 static fo_fdclose_t soo_fdclose;
94 static fo_chmod_t soo_chmod;
95 static fo_fill_kinfo_t soo_fill_kinfo;
96 static fo_aio_queue_t soo_aio_queue;
97
98 static void soo_aio_cancel(struct kaiocb *job);
99
100 const struct fileops socketops = {
101 .fo_read = soo_read,
102 .fo_write = soo_write,
103 .fo_truncate = invfo_truncate,
104 .fo_ioctl = soo_ioctl,
105 .fo_poll = soo_poll,
106 .fo_kqfilter = soo_kqfilter,
107 .fo_stat = soo_stat,
108 .fo_close = soo_close,
109 .fo_fdclose = soo_fdclose,
110 .fo_chmod = soo_chmod,
111 .fo_chown = invfo_chown,
112 .fo_sendfile = invfo_sendfile,
113 .fo_fill_kinfo = soo_fill_kinfo,
114 .fo_aio_queue = soo_aio_queue,
115 .fo_cmp = file_kcmp_generic,
116 .fo_flags = DFLAG_PASSABLE
117 };
118
119 static int
soo_read(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)120 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
121 int flags, struct thread *td)
122 {
123 struct socket *so = fp->f_data;
124 int error;
125
126 #ifdef MAC
127 error = mac_socket_check_receive(active_cred, so);
128 if (error)
129 return (error);
130 #endif
131 error = soreceive(so, 0, uio, 0, 0, 0);
132 return (error);
133 }
134
135 static int
soo_write(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)136 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
137 int flags, struct thread *td)
138 {
139 struct socket *so = fp->f_data;
140 int error;
141
142 #ifdef MAC
143 error = mac_socket_check_send(active_cred, so);
144 if (error)
145 return (error);
146 #endif
147 error = sousrsend(so, NULL, uio, NULL, 0, NULL);
148 return (error);
149 }
150
151 static int
soo_ioctl(struct file * fp,u_long cmd,void * data,struct ucred * active_cred,struct thread * td)152 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
153 struct thread *td)
154 {
155 struct socket *so = fp->f_data;
156 int error = 0;
157
158 switch (cmd) {
159 case FIONBIO:
160 SOCK_LOCK(so);
161 if (*(int *)data)
162 so->so_state |= SS_NBIO;
163 else
164 so->so_state &= ~SS_NBIO;
165 SOCK_UNLOCK(so);
166 break;
167
168 case FIOASYNC:
169 if (*(int *)data) {
170 SOCK_LOCK(so);
171 so->so_state |= SS_ASYNC;
172 if (SOLISTENING(so)) {
173 so->sol_sbrcv_flags |= SB_ASYNC;
174 so->sol_sbsnd_flags |= SB_ASYNC;
175 } else {
176 SOCK_RECVBUF_LOCK(so);
177 so->so_rcv.sb_flags |= SB_ASYNC;
178 SOCK_RECVBUF_UNLOCK(so);
179 SOCK_SENDBUF_LOCK(so);
180 so->so_snd.sb_flags |= SB_ASYNC;
181 SOCK_SENDBUF_UNLOCK(so);
182 }
183 SOCK_UNLOCK(so);
184 } else {
185 SOCK_LOCK(so);
186 so->so_state &= ~SS_ASYNC;
187 if (SOLISTENING(so)) {
188 so->sol_sbrcv_flags &= ~SB_ASYNC;
189 so->sol_sbsnd_flags &= ~SB_ASYNC;
190 } else {
191 SOCK_RECVBUF_LOCK(so);
192 so->so_rcv.sb_flags &= ~SB_ASYNC;
193 SOCK_RECVBUF_UNLOCK(so);
194 SOCK_SENDBUF_LOCK(so);
195 so->so_snd.sb_flags &= ~SB_ASYNC;
196 SOCK_SENDBUF_UNLOCK(so);
197 }
198 SOCK_UNLOCK(so);
199 }
200 break;
201
202 case FIONREAD:
203 SOCK_RECVBUF_LOCK(so);
204 if (SOLISTENING(so)) {
205 error = EINVAL;
206 } else {
207 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl;
208 }
209 SOCK_RECVBUF_UNLOCK(so);
210 break;
211
212 case FIONWRITE:
213 /* Unlocked read. */
214 if (SOLISTENING(so)) {
215 error = EINVAL;
216 } else {
217 *(int *)data = sbavail(&so->so_snd);
218 }
219 break;
220
221 case FIONSPACE:
222 /* Unlocked read. */
223 if (SOLISTENING(so)) {
224 error = EINVAL;
225 } else {
226 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) ||
227 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) {
228 *(int *)data = 0;
229 } else {
230 *(int *)data = sbspace(&so->so_snd);
231 }
232 }
233 break;
234
235 case FIOSETOWN:
236 error = fsetown(*(int *)data, &so->so_sigio);
237 break;
238
239 case FIOGETOWN:
240 *(int *)data = fgetown(&so->so_sigio);
241 break;
242
243 case SIOCSPGRP:
244 error = fsetown(-(*(int *)data), &so->so_sigio);
245 break;
246
247 case SIOCGPGRP:
248 *(int *)data = -fgetown(&so->so_sigio);
249 break;
250
251 case SIOCATMARK:
252 /* Unlocked read. */
253 if (SOLISTENING(so)) {
254 error = EINVAL;
255 } else {
256 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
257 }
258 break;
259 default:
260 /*
261 * Interface/routing/protocol specific ioctls: interface and
262 * routing ioctls should have a different entry since a
263 * socket is unnecessary.
264 */
265 if (IOCGROUP(cmd) == 'i')
266 error = ifioctl(so, cmd, data, td);
267 else if (IOCGROUP(cmd) == 'r') {
268 CURVNET_SET(so->so_vnet);
269 error = rtioctl_fib(cmd, data, so->so_fibnum);
270 CURVNET_RESTORE();
271 } else {
272 CURVNET_SET(so->so_vnet);
273 error = so->so_proto->pr_control(so, cmd, data, 0, td);
274 CURVNET_RESTORE();
275 }
276 break;
277 }
278 return (error);
279 }
280
281 static int
soo_poll(struct file * fp,int events,struct ucred * active_cred,struct thread * td)282 soo_poll(struct file *fp, int events, struct ucred *active_cred,
283 struct thread *td)
284 {
285 struct socket *so = fp->f_data;
286 #ifdef MAC
287 int error;
288
289 error = mac_socket_check_poll(active_cred, so);
290 if (error)
291 return (error);
292 #endif
293 return (so->so_proto->pr_sopoll(so, events, td));
294 }
295
296 static int
soo_kqfilter(struct file * fp,struct knote * kn)297 soo_kqfilter(struct file *fp, struct knote *kn)
298 {
299 struct socket *so = fp->f_data;
300
301 return (so->so_proto->pr_kqfilter(so, kn));
302 }
303
304 static int
soo_stat(struct file * fp,struct stat * ub,struct ucred * active_cred)305 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred)
306 {
307 struct socket *so = fp->f_data;
308 int error = 0;
309
310 bzero((caddr_t)ub, sizeof (*ub));
311 ub->st_mode = S_IFSOCK;
312 #ifdef MAC
313 error = mac_socket_check_stat(active_cred, so);
314 if (error)
315 return (error);
316 #endif
317 SOCK_LOCK(so);
318 if (!SOLISTENING(so)) {
319 struct sockbuf *sb;
320
321 /*
322 * If SBS_CANTRCVMORE is set, but there's still data left
323 * in the receive buffer, the socket is still readable.
324 */
325 sb = &so->so_rcv;
326 SOCK_RECVBUF_LOCK(so);
327 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb))
328 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
329 ub->st_size = sbavail(sb) - sb->sb_ctl;
330 SOCK_RECVBUF_UNLOCK(so);
331
332 sb = &so->so_snd;
333 SOCK_SENDBUF_LOCK(so);
334 if ((sb->sb_state & SBS_CANTSENDMORE) == 0)
335 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
336 SOCK_SENDBUF_UNLOCK(so);
337 }
338 ub->st_uid = so->so_cred->cr_uid;
339 ub->st_gid = so->so_cred->cr_gid;
340 if (so->so_proto->pr_sense)
341 error = so->so_proto->pr_sense(so, ub);
342 SOCK_UNLOCK(so);
343 return (error);
344 }
345
346 /*
347 * API socket close on file pointer. We call soclose() to close the socket
348 * (including initiating closing protocols). soclose() will sorele() the
349 * file reference but the actual socket will not go away until the socket's
350 * ref count hits 0.
351 */
352 static int
soo_close(struct file * fp,struct thread * td)353 soo_close(struct file *fp, struct thread *td)
354 {
355 int error = 0;
356 struct socket *so;
357
358 so = fp->f_data;
359 fp->f_ops = &badfileops;
360 fp->f_data = NULL;
361
362 if (so)
363 error = soclose(so);
364 return (error);
365 }
366
367 static void
soo_fdclose(struct file * fp,int fd __unused,struct thread * td)368 soo_fdclose(struct file *fp, int fd __unused, struct thread *td)
369 {
370 struct socket *so;
371
372 so = fp->f_data;
373 if (so->so_proto->pr_fdclose != NULL)
374 so->so_proto->pr_fdclose(so);
375 }
376
377 static int
soo_chmod(struct file * fp,mode_t mode,struct ucred * cred,struct thread * td)378 soo_chmod(struct file *fp, mode_t mode, struct ucred *cred, struct thread *td)
379 {
380 struct socket *so;
381 int error;
382
383 so = fp->f_data;
384 if (so->so_proto->pr_chmod != NULL)
385 error = so->so_proto->pr_chmod(so, mode, cred, td);
386 else
387 error = EINVAL;
388 return (error);
389 }
390
391 static int
soo_fill_kinfo(struct file * fp,struct kinfo_file * kif,struct filedesc * fdp)392 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
393 {
394 struct sockaddr_storage ss = { .ss_len = sizeof(ss) };
395 struct unpcb *unpcb;
396 struct socket *so;
397 int error;
398
399 kif->kf_type = KF_TYPE_SOCKET;
400 so = fp->f_data;
401 CURVNET_SET(so->so_vnet);
402 kif->kf_un.kf_sock.kf_sock_domain0 =
403 so->so_proto->pr_domain->dom_family;
404 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type;
405 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol;
406 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb;
407 switch (kif->kf_un.kf_sock.kf_sock_domain0) {
408 case AF_INET:
409 case AF_INET6:
410 /* XXX: kf_sock_inpcb is obsolete. It may be removed. */
411 kif->kf_un.kf_sock.kf_sock_inpcb = (uintptr_t)so->so_pcb;
412 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
413 so->so_rcv.sb_state;
414 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
415 so->so_snd.sb_state;
416 kif->kf_un.kf_sock.kf_sock_sendq =
417 sbused(&so->so_snd);
418 kif->kf_un.kf_sock.kf_sock_recvq =
419 sbused(&so->so_rcv);
420 break;
421 case AF_UNIX:
422 if (so->so_pcb != NULL) {
423 unpcb = (struct unpcb *)(so->so_pcb);
424 if (unpcb->unp_conn) {
425 kif->kf_un.kf_sock.kf_sock_unpconn =
426 (uintptr_t)unpcb->unp_conn;
427 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
428 so->so_rcv.sb_state;
429 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
430 so->so_snd.sb_state;
431 kif->kf_un.kf_sock.kf_sock_sendq =
432 sbused(&so->so_snd);
433 kif->kf_un.kf_sock.kf_sock_recvq =
434 sbused(&so->so_rcv);
435 }
436 }
437 break;
438 }
439 error = sosockaddr(so, (struct sockaddr *)&ss);
440 if (error == 0 &&
441 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) {
442 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_local, ss.ss_len);
443 }
444 ss.ss_len = sizeof(ss);
445 error = sopeeraddr(so, (struct sockaddr *)&ss);
446 if (error == 0 &&
447 ss.ss_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) {
448 bcopy(&ss, &kif->kf_un.kf_sock.kf_sa_peer, ss.ss_len);
449 }
450 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name,
451 sizeof(kif->kf_path));
452 CURVNET_RESTORE();
453 return (0);
454 }
455
456 /*
457 * Use the 'backend3' field in AIO jobs to store the amount of data
458 * completed by the AIO job so far.
459 */
460 #define aio_done backend3
461
462 static STAILQ_HEAD(, task) soaio_jobs;
463 static struct mtx soaio_jobs_lock;
464 static struct task soaio_kproc_task;
465 static int soaio_starting, soaio_idle, soaio_queued;
466 static struct unrhdr *soaio_kproc_unr;
467
468 static int soaio_max_procs = MAX_AIO_PROCS;
469 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0,
470 "Maximum number of kernel processes to use for async socket IO");
471
472 static int soaio_num_procs;
473 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0,
474 "Number of active kernel processes for async socket IO");
475
476 static int soaio_target_procs = TARGET_AIO_PROCS;
477 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD,
478 &soaio_target_procs, 0,
479 "Preferred number of ready kernel processes for async socket IO");
480
481 static int soaio_lifetime;
482 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0,
483 "Maximum lifetime for idle aiod");
484
485 static void
soaio_kproc_loop(void * arg)486 soaio_kproc_loop(void *arg)
487 {
488 struct proc *p;
489 struct vmspace *myvm;
490 struct task *task;
491 int error, id, pending;
492
493 id = (intptr_t)arg;
494
495 /*
496 * Grab an extra reference on the daemon's vmspace so that it
497 * doesn't get freed by jobs that switch to a different
498 * vmspace.
499 */
500 p = curproc;
501 myvm = vmspace_acquire_ref(p);
502
503 mtx_lock(&soaio_jobs_lock);
504 MPASS(soaio_starting > 0);
505 soaio_starting--;
506 for (;;) {
507 while (!STAILQ_EMPTY(&soaio_jobs)) {
508 task = STAILQ_FIRST(&soaio_jobs);
509 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link);
510 soaio_queued--;
511 pending = task->ta_pending;
512 task->ta_pending = 0;
513 mtx_unlock(&soaio_jobs_lock);
514
515 task->ta_func(task->ta_context, pending);
516
517 mtx_lock(&soaio_jobs_lock);
518 }
519 MPASS(soaio_queued == 0);
520
521 if (p->p_vmspace != myvm) {
522 mtx_unlock(&soaio_jobs_lock);
523 vmspace_switch_aio(myvm);
524 mtx_lock(&soaio_jobs_lock);
525 continue;
526 }
527
528 soaio_idle++;
529 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-",
530 soaio_lifetime);
531 soaio_idle--;
532 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) &&
533 soaio_num_procs > soaio_target_procs)
534 break;
535 }
536 soaio_num_procs--;
537 mtx_unlock(&soaio_jobs_lock);
538 free_unr(soaio_kproc_unr, id);
539 kproc_exit(0);
540 }
541
542 static void
soaio_kproc_create(void * context,int pending)543 soaio_kproc_create(void *context, int pending)
544 {
545 struct proc *p;
546 int error, id;
547
548 mtx_lock(&soaio_jobs_lock);
549 for (;;) {
550 if (soaio_num_procs < soaio_target_procs) {
551 /* Must create */
552 } else if (soaio_num_procs >= soaio_max_procs) {
553 /*
554 * Hit the limit on kernel processes, don't
555 * create another one.
556 */
557 break;
558 } else if (soaio_queued <= soaio_idle + soaio_starting) {
559 /*
560 * No more AIO jobs waiting for a process to be
561 * created, so stop.
562 */
563 break;
564 }
565 soaio_starting++;
566 mtx_unlock(&soaio_jobs_lock);
567
568 id = alloc_unr(soaio_kproc_unr);
569 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id,
570 &p, 0, 0, "soaiod%d", id);
571 if (error != 0) {
572 free_unr(soaio_kproc_unr, id);
573 mtx_lock(&soaio_jobs_lock);
574 soaio_starting--;
575 break;
576 }
577
578 mtx_lock(&soaio_jobs_lock);
579 soaio_num_procs++;
580 }
581 mtx_unlock(&soaio_jobs_lock);
582 }
583
584 void
soaio_enqueue(struct task * task)585 soaio_enqueue(struct task *task)
586 {
587
588 mtx_lock(&soaio_jobs_lock);
589 MPASS(task->ta_pending == 0);
590 task->ta_pending++;
591 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link);
592 soaio_queued++;
593 if (soaio_queued <= soaio_idle)
594 wakeup_one(&soaio_idle);
595 else if (soaio_num_procs < soaio_max_procs)
596 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task);
597 mtx_unlock(&soaio_jobs_lock);
598 }
599
600 static void
soaio_init(void * dummy __unused)601 soaio_init(void *dummy __unused)
602 {
603
604 soaio_lifetime = AIOD_LIFETIME_DEFAULT;
605 STAILQ_INIT(&soaio_jobs);
606 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF);
607 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL);
608 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL);
609 }
610 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL);
611
612 static __inline int
soaio_ready(struct socket * so,struct sockbuf * sb)613 soaio_ready(struct socket *so, struct sockbuf *sb)
614 {
615 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so));
616 }
617
618 static void
soaio_process_job(struct socket * so,sb_which which,struct kaiocb * job)619 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job)
620 {
621 struct ucred *td_savedcred;
622 struct thread *td;
623 struct sockbuf *sb = sobuf(so, which);
624 #ifdef MAC
625 struct file *fp = job->fd_file;
626 #endif
627 size_t cnt, done, job_total_nbytes __diagused;
628 long ru_before;
629 int error, flags;
630
631 SOCK_BUF_UNLOCK(so, which);
632 aio_switch_vmspace(job);
633 td = curthread;
634 retry:
635 td_savedcred = td->td_ucred;
636 td->td_ucred = job->cred;
637
638 job_total_nbytes = job->uiop->uio_resid + job->aio_done;
639 done = job->aio_done;
640 cnt = job->uiop->uio_resid;
641 job->uiop->uio_offset = 0;
642 job->uiop->uio_td = td;
643 flags = MSG_NBIO;
644
645 /*
646 * For resource usage accounting, only count a completed request
647 * as a single message to avoid counting multiple calls to
648 * sosend/soreceive on a blocking socket.
649 */
650
651 if (sb == &so->so_rcv) {
652 ru_before = td->td_ru.ru_msgrcv;
653 #ifdef MAC
654 error = mac_socket_check_receive(fp->f_cred, so);
655 if (error == 0)
656
657 #endif
658 error = soreceive(so, NULL, job->uiop, NULL, NULL,
659 &flags);
660 if (td->td_ru.ru_msgrcv != ru_before)
661 job->msgrcv = 1;
662 } else {
663 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
664 flags |= MSG_MORETOCOME;
665 ru_before = td->td_ru.ru_msgsnd;
666 #ifdef MAC
667 error = mac_socket_check_send(fp->f_cred, so);
668 if (error == 0)
669 #endif
670 error = sousrsend(so, NULL, job->uiop, NULL, flags,
671 job->userproc);
672 if (td->td_ru.ru_msgsnd != ru_before)
673 job->msgsnd = 1;
674 }
675
676 done += cnt - job->uiop->uio_resid;
677 job->aio_done = done;
678 td->td_ucred = td_savedcred;
679
680 if (error == EWOULDBLOCK) {
681 /*
682 * The request was either partially completed or not
683 * completed at all due to racing with a read() or
684 * write() on the socket. If the socket is
685 * non-blocking, return with any partial completion.
686 * If the socket is blocking or if no progress has
687 * been made, requeue this request at the head of the
688 * queue to try again when the socket is ready.
689 */
690 MPASS(done != job_total_nbytes);
691 SOCK_BUF_LOCK(so, which);
692 if (done == 0 || !(so->so_state & SS_NBIO)) {
693 empty_results++;
694 if (soaio_ready(so, sb)) {
695 empty_retries++;
696 SOCK_BUF_UNLOCK(so, which);
697 goto retry;
698 }
699
700 if (!aio_set_cancel_function(job, soo_aio_cancel)) {
701 SOCK_BUF_UNLOCK(so, which);
702 if (done != 0)
703 aio_complete(job, done, 0);
704 else
705 aio_cancel(job);
706 SOCK_BUF_LOCK(so, which);
707 } else {
708 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list);
709 }
710 return;
711 }
712 SOCK_BUF_UNLOCK(so, which);
713 }
714 if (done != 0 && (error == ERESTART || error == EINTR ||
715 error == EWOULDBLOCK))
716 error = 0;
717 if (error)
718 aio_complete(job, -1, error);
719 else
720 aio_complete(job, done, 0);
721 SOCK_BUF_LOCK(so, which);
722 }
723
724 static void
soaio_process_sb(struct socket * so,sb_which which)725 soaio_process_sb(struct socket *so, sb_which which)
726 {
727 struct kaiocb *job;
728 struct sockbuf *sb = sobuf(so, which);
729
730 CURVNET_SET(so->so_vnet);
731 SOCK_BUF_LOCK(so, which);
732 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) {
733 job = TAILQ_FIRST(&sb->sb_aiojobq);
734 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
735 if (!aio_clear_cancel_function(job))
736 continue;
737
738 soaio_process_job(so, which, job);
739 }
740
741 /*
742 * If there are still pending requests, the socket must not be
743 * ready so set SB_AIO to request a wakeup when the socket
744 * becomes ready.
745 */
746 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
747 sb->sb_flags |= SB_AIO;
748 sb->sb_flags &= ~SB_AIO_RUNNING;
749 SOCK_BUF_UNLOCK(so, which);
750
751 sorele(so);
752 CURVNET_RESTORE();
753 }
754
755 void
soaio_rcv(void * context,int pending)756 soaio_rcv(void *context, int pending)
757 {
758 struct socket *so;
759
760 so = context;
761 soaio_process_sb(so, SO_RCV);
762 }
763
764 void
soaio_snd(void * context,int pending)765 soaio_snd(void *context, int pending)
766 {
767 struct socket *so;
768
769 so = context;
770 soaio_process_sb(so, SO_SND);
771 }
772
773 void
sowakeup_aio(struct socket * so,sb_which which)774 sowakeup_aio(struct socket *so, sb_which which)
775 {
776 struct sockbuf *sb = sobuf(so, which);
777
778 SOCK_BUF_LOCK_ASSERT(so, which);
779
780 sb->sb_flags &= ~SB_AIO;
781 if (sb->sb_flags & SB_AIO_RUNNING)
782 return;
783 sb->sb_flags |= SB_AIO_RUNNING;
784 soref(so);
785 soaio_enqueue(&sb->sb_aiotask);
786 }
787
788 static void
soo_aio_cancel(struct kaiocb * job)789 soo_aio_cancel(struct kaiocb *job)
790 {
791 struct socket *so;
792 struct sockbuf *sb;
793 long done;
794 int opcode;
795 sb_which which;
796
797 so = job->fd_file->f_data;
798 opcode = job->uaiocb.aio_lio_opcode;
799 if (opcode & LIO_READ) {
800 sb = &so->so_rcv;
801 which = SO_RCV;
802 } else {
803 MPASS(opcode & LIO_WRITE);
804 sb = &so->so_snd;
805 which = SO_SND;
806 }
807
808 SOCK_BUF_LOCK(so, which);
809 if (!aio_cancel_cleared(job))
810 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
811 if (TAILQ_EMPTY(&sb->sb_aiojobq))
812 sb->sb_flags &= ~SB_AIO;
813 SOCK_BUF_UNLOCK(so, which);
814
815 done = job->aio_done;
816 if (done != 0)
817 aio_complete(job, done, 0);
818 else
819 aio_cancel(job);
820 }
821
822 static int
soo_aio_queue(struct file * fp,struct kaiocb * job)823 soo_aio_queue(struct file *fp, struct kaiocb *job)
824 {
825 struct socket *so = fp->f_data;
826
827 return (so->so_proto->pr_aio_queue(so, job));
828 }
829
830 int
soaio_queue_generic(struct socket * so,struct kaiocb * job)831 soaio_queue_generic(struct socket *so, struct kaiocb *job)
832 {
833 struct sockbuf *sb;
834 sb_which which;
835
836 /* Lock through the socket, since this may be a listening socket. */
837 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) {
838 case LIO_READ:
839 SOCK_RECVBUF_LOCK(so);
840 sb = &so->so_rcv;
841 which = SO_RCV;
842 break;
843 case LIO_WRITE:
844 SOCK_SENDBUF_LOCK(so);
845 sb = &so->so_snd;
846 which = SO_SND;
847 break;
848 default:
849 return (EINVAL);
850 }
851
852 if (SOLISTENING(so)) {
853 SOCK_BUF_UNLOCK(so, which);
854 return (EINVAL);
855 }
856
857 if (!aio_set_cancel_function(job, soo_aio_cancel))
858 panic("new job was cancelled");
859 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list);
860 if (!(sb->sb_flags & SB_AIO_RUNNING)) {
861 if (soaio_ready(so, sb))
862 sowakeup_aio(so, which);
863 else
864 sb->sb_flags |= SB_AIO;
865 }
866 SOCK_BUF_UNLOCK(so, which);
867 return (0);
868 }
869