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 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93
32 */
33
34 #include <sys/cdefs.h>
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/aio.h>
38 #include <sys/domain.h>
39 #include <sys/file.h>
40 #include <sys/filedesc.h>
41 #include <sys/kernel.h>
42 #include <sys/kthread.h>
43 #include <sys/malloc.h>
44 #include <sys/proc.h>
45 #include <sys/protosw.h>
46 #include <sys/sigio.h>
47 #include <sys/signal.h>
48 #include <sys/signalvar.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/filio.h> /* XXX */
52 #include <sys/sockio.h>
53 #include <sys/stat.h>
54 #include <sys/sysctl.h>
55 #include <sys/sysproto.h>
56 #include <sys/taskqueue.h>
57 #include <sys/uio.h>
58 #include <sys/ucred.h>
59 #include <sys/un.h>
60 #include <sys/unpcb.h>
61 #include <sys/user.h>
62
63 #include <net/if.h>
64 #include <net/if_var.h>
65 #include <net/route.h>
66 #include <net/vnet.h>
67
68 #include <netinet/in.h>
69 #include <netinet/in_pcb.h>
70
71 #include <security/mac/mac_framework.h>
72
73 #include <vm/vm.h>
74 #include <vm/pmap.h>
75 #include <vm/vm_extern.h>
76 #include <vm/vm_map.h>
77
78 static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
79 "socket AIO stats");
80
81 static int empty_results;
82 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results,
83 0, "socket operation returned EAGAIN");
84
85 static int empty_retries;
86 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries,
87 0, "socket operation retries");
88
89 static fo_rdwr_t soo_read;
90 static fo_rdwr_t soo_write;
91 static fo_ioctl_t soo_ioctl;
92 static fo_poll_t soo_poll;
93 extern fo_kqfilter_t soo_kqfilter;
94 static fo_stat_t soo_stat;
95 static fo_close_t soo_close;
96 static fo_chmod_t soo_chmod;
97 static fo_fill_kinfo_t soo_fill_kinfo;
98 static fo_aio_queue_t soo_aio_queue;
99
100 static void soo_aio_cancel(struct kaiocb *job);
101
102 const struct fileops socketops = {
103 .fo_read = soo_read,
104 .fo_write = soo_write,
105 .fo_truncate = invfo_truncate,
106 .fo_ioctl = soo_ioctl,
107 .fo_poll = soo_poll,
108 .fo_kqfilter = soo_kqfilter,
109 .fo_stat = soo_stat,
110 .fo_close = soo_close,
111 .fo_chmod = soo_chmod,
112 .fo_chown = invfo_chown,
113 .fo_sendfile = invfo_sendfile,
114 .fo_fill_kinfo = soo_fill_kinfo,
115 .fo_aio_queue = soo_aio_queue,
116 .fo_cmp = file_kcmp_generic,
117 .fo_flags = DFLAG_PASSABLE
118 };
119
120 static int
soo_read(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)121 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
122 int flags, struct thread *td)
123 {
124 struct socket *so = fp->f_data;
125 int error;
126
127 #ifdef MAC
128 error = mac_socket_check_receive(active_cred, so);
129 if (error)
130 return (error);
131 #endif
132 error = soreceive(so, 0, uio, 0, 0, 0);
133 return (error);
134 }
135
136 static int
soo_write(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)137 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
138 int flags, struct thread *td)
139 {
140 struct socket *so = fp->f_data;
141 int error;
142
143 #ifdef MAC
144 error = mac_socket_check_send(active_cred, so);
145 if (error)
146 return (error);
147 #endif
148 error = sousrsend(so, NULL, uio, NULL, 0, NULL);
149 return (error);
150 }
151
152 static int
soo_ioctl(struct file * fp,u_long cmd,void * data,struct ucred * active_cred,struct thread * td)153 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred,
154 struct thread *td)
155 {
156 struct socket *so = fp->f_data;
157 int error = 0;
158
159 switch (cmd) {
160 case FIONBIO:
161 SOCK_LOCK(so);
162 if (*(int *)data)
163 so->so_state |= SS_NBIO;
164 else
165 so->so_state &= ~SS_NBIO;
166 SOCK_UNLOCK(so);
167 break;
168
169 case FIOASYNC:
170 if (*(int *)data) {
171 SOCK_LOCK(so);
172 so->so_state |= SS_ASYNC;
173 if (SOLISTENING(so)) {
174 so->sol_sbrcv_flags |= SB_ASYNC;
175 so->sol_sbsnd_flags |= SB_ASYNC;
176 } else {
177 SOCK_RECVBUF_LOCK(so);
178 so->so_rcv.sb_flags |= SB_ASYNC;
179 SOCK_RECVBUF_UNLOCK(so);
180 SOCK_SENDBUF_LOCK(so);
181 so->so_snd.sb_flags |= SB_ASYNC;
182 SOCK_SENDBUF_UNLOCK(so);
183 }
184 SOCK_UNLOCK(so);
185 } else {
186 SOCK_LOCK(so);
187 so->so_state &= ~SS_ASYNC;
188 if (SOLISTENING(so)) {
189 so->sol_sbrcv_flags &= ~SB_ASYNC;
190 so->sol_sbsnd_flags &= ~SB_ASYNC;
191 } else {
192 SOCK_RECVBUF_LOCK(so);
193 so->so_rcv.sb_flags &= ~SB_ASYNC;
194 SOCK_RECVBUF_UNLOCK(so);
195 SOCK_SENDBUF_LOCK(so);
196 so->so_snd.sb_flags &= ~SB_ASYNC;
197 SOCK_SENDBUF_UNLOCK(so);
198 }
199 SOCK_UNLOCK(so);
200 }
201 break;
202
203 case FIONREAD:
204 SOCK_RECVBUF_LOCK(so);
205 if (SOLISTENING(so)) {
206 error = EINVAL;
207 } else {
208 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl;
209 }
210 SOCK_RECVBUF_UNLOCK(so);
211 break;
212
213 case FIONWRITE:
214 /* Unlocked read. */
215 if (SOLISTENING(so)) {
216 error = EINVAL;
217 } else {
218 *(int *)data = sbavail(&so->so_snd);
219 }
220 break;
221
222 case FIONSPACE:
223 /* Unlocked read. */
224 if (SOLISTENING(so)) {
225 error = EINVAL;
226 } else {
227 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) ||
228 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) {
229 *(int *)data = 0;
230 } else {
231 *(int *)data = sbspace(&so->so_snd);
232 }
233 }
234 break;
235
236 case FIOSETOWN:
237 error = fsetown(*(int *)data, &so->so_sigio);
238 break;
239
240 case FIOGETOWN:
241 *(int *)data = fgetown(&so->so_sigio);
242 break;
243
244 case SIOCSPGRP:
245 error = fsetown(-(*(int *)data), &so->so_sigio);
246 break;
247
248 case SIOCGPGRP:
249 *(int *)data = -fgetown(&so->so_sigio);
250 break;
251
252 case SIOCATMARK:
253 /* Unlocked read. */
254 if (SOLISTENING(so)) {
255 error = EINVAL;
256 } else {
257 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0;
258 }
259 break;
260 default:
261 /*
262 * Interface/routing/protocol specific ioctls: interface and
263 * routing ioctls should have a different entry since a
264 * socket is unnecessary.
265 */
266 if (IOCGROUP(cmd) == 'i')
267 error = ifioctl(so, cmd, data, td);
268 else if (IOCGROUP(cmd) == 'r') {
269 CURVNET_SET(so->so_vnet);
270 error = rtioctl_fib(cmd, data, so->so_fibnum);
271 CURVNET_RESTORE();
272 } else {
273 CURVNET_SET(so->so_vnet);
274 error = so->so_proto->pr_control(so, cmd, data, 0, td);
275 CURVNET_RESTORE();
276 }
277 break;
278 }
279 return (error);
280 }
281
282 static int
soo_poll(struct file * fp,int events,struct ucred * active_cred,struct thread * td)283 soo_poll(struct file *fp, int events, struct ucred *active_cred,
284 struct thread *td)
285 {
286 struct socket *so = fp->f_data;
287 #ifdef MAC
288 int error;
289
290 error = mac_socket_check_poll(active_cred, so);
291 if (error)
292 return (error);
293 #endif
294 return (sopoll(so, events, fp->f_cred, td));
295 }
296
297 static int
soo_stat(struct file * fp,struct stat * ub,struct ucred * active_cred)298 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred)
299 {
300 struct socket *so = fp->f_data;
301 int error = 0;
302
303 bzero((caddr_t)ub, sizeof (*ub));
304 ub->st_mode = S_IFSOCK;
305 #ifdef MAC
306 error = mac_socket_check_stat(active_cred, so);
307 if (error)
308 return (error);
309 #endif
310 SOCK_LOCK(so);
311 if (!SOLISTENING(so)) {
312 struct sockbuf *sb;
313
314 /*
315 * If SBS_CANTRCVMORE is set, but there's still data left
316 * in the receive buffer, the socket is still readable.
317 */
318 sb = &so->so_rcv;
319 SOCK_RECVBUF_LOCK(so);
320 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb))
321 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
322 ub->st_size = sbavail(sb) - sb->sb_ctl;
323 SOCK_RECVBUF_UNLOCK(so);
324
325 sb = &so->so_snd;
326 SOCK_SENDBUF_LOCK(so);
327 if ((sb->sb_state & SBS_CANTSENDMORE) == 0)
328 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
329 SOCK_SENDBUF_UNLOCK(so);
330 }
331 ub->st_uid = so->so_cred->cr_uid;
332 ub->st_gid = so->so_cred->cr_gid;
333 if (so->so_proto->pr_sense)
334 error = so->so_proto->pr_sense(so, ub);
335 SOCK_UNLOCK(so);
336 return (error);
337 }
338
339 /*
340 * API socket close on file pointer. We call soclose() to close the socket
341 * (including initiating closing protocols). soclose() will sorele() the
342 * file reference but the actual socket will not go away until the socket's
343 * ref count hits 0.
344 */
345 static int
soo_close(struct file * fp,struct thread * td)346 soo_close(struct file *fp, struct thread *td)
347 {
348 int error = 0;
349 struct socket *so;
350
351 so = fp->f_data;
352 fp->f_ops = &badfileops;
353 fp->f_data = NULL;
354
355 if (so)
356 error = soclose(so);
357 return (error);
358 }
359
360 static int
soo_chmod(struct file * fp,mode_t mode,struct ucred * cred,struct thread * td)361 soo_chmod(struct file *fp, mode_t mode, struct ucred *cred, struct thread *td)
362 {
363 struct socket *so;
364 int error;
365
366 so = fp->f_data;
367 if (so->so_proto->pr_chmod != NULL)
368 error = so->so_proto->pr_chmod(so, mode, cred, td);
369 else
370 error = EINVAL;
371 return (error);
372 }
373
374 static int
soo_fill_kinfo(struct file * fp,struct kinfo_file * kif,struct filedesc * fdp)375 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
376 {
377 struct sockaddr *sa;
378 struct inpcb *inpcb;
379 struct unpcb *unpcb;
380 struct socket *so;
381 int error;
382
383 kif->kf_type = KF_TYPE_SOCKET;
384 so = fp->f_data;
385 CURVNET_SET(so->so_vnet);
386 kif->kf_un.kf_sock.kf_sock_domain0 =
387 so->so_proto->pr_domain->dom_family;
388 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type;
389 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol;
390 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb;
391 switch (kif->kf_un.kf_sock.kf_sock_domain0) {
392 case AF_INET:
393 case AF_INET6:
394 if (so->so_pcb != NULL) {
395 inpcb = (struct inpcb *)(so->so_pcb);
396 kif->kf_un.kf_sock.kf_sock_inpcb =
397 (uintptr_t)inpcb->inp_ppcb;
398 }
399 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
400 so->so_rcv.sb_state;
401 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
402 so->so_snd.sb_state;
403 kif->kf_un.kf_sock.kf_sock_sendq =
404 sbused(&so->so_snd);
405 kif->kf_un.kf_sock.kf_sock_recvq =
406 sbused(&so->so_rcv);
407 break;
408 case AF_UNIX:
409 if (so->so_pcb != NULL) {
410 unpcb = (struct unpcb *)(so->so_pcb);
411 if (unpcb->unp_conn) {
412 kif->kf_un.kf_sock.kf_sock_unpconn =
413 (uintptr_t)unpcb->unp_conn;
414 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
415 so->so_rcv.sb_state;
416 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
417 so->so_snd.sb_state;
418 kif->kf_un.kf_sock.kf_sock_sendq =
419 sbused(&so->so_snd);
420 kif->kf_un.kf_sock.kf_sock_recvq =
421 sbused(&so->so_rcv);
422 }
423 }
424 break;
425 }
426 error = so->so_proto->pr_sockaddr(so, &sa);
427 if (error == 0 &&
428 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) {
429 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len);
430 free(sa, M_SONAME);
431 }
432 error = so->so_proto->pr_peeraddr(so, &sa);
433 if (error == 0 &&
434 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) {
435 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len);
436 free(sa, M_SONAME);
437 }
438 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name,
439 sizeof(kif->kf_path));
440 CURVNET_RESTORE();
441 return (0);
442 }
443
444 /*
445 * Use the 'backend3' field in AIO jobs to store the amount of data
446 * completed by the AIO job so far.
447 */
448 #define aio_done backend3
449
450 static STAILQ_HEAD(, task) soaio_jobs;
451 static struct mtx soaio_jobs_lock;
452 static struct task soaio_kproc_task;
453 static int soaio_starting, soaio_idle, soaio_queued;
454 static struct unrhdr *soaio_kproc_unr;
455
456 static int soaio_max_procs = MAX_AIO_PROCS;
457 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0,
458 "Maximum number of kernel processes to use for async socket IO");
459
460 static int soaio_num_procs;
461 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0,
462 "Number of active kernel processes for async socket IO");
463
464 static int soaio_target_procs = TARGET_AIO_PROCS;
465 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD,
466 &soaio_target_procs, 0,
467 "Preferred number of ready kernel processes for async socket IO");
468
469 static int soaio_lifetime;
470 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0,
471 "Maximum lifetime for idle aiod");
472
473 static void
soaio_kproc_loop(void * arg)474 soaio_kproc_loop(void *arg)
475 {
476 struct proc *p;
477 struct vmspace *myvm;
478 struct task *task;
479 int error, id, pending;
480
481 id = (intptr_t)arg;
482
483 /*
484 * Grab an extra reference on the daemon's vmspace so that it
485 * doesn't get freed by jobs that switch to a different
486 * vmspace.
487 */
488 p = curproc;
489 myvm = vmspace_acquire_ref(p);
490
491 mtx_lock(&soaio_jobs_lock);
492 MPASS(soaio_starting > 0);
493 soaio_starting--;
494 for (;;) {
495 while (!STAILQ_EMPTY(&soaio_jobs)) {
496 task = STAILQ_FIRST(&soaio_jobs);
497 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link);
498 soaio_queued--;
499 pending = task->ta_pending;
500 task->ta_pending = 0;
501 mtx_unlock(&soaio_jobs_lock);
502
503 task->ta_func(task->ta_context, pending);
504
505 mtx_lock(&soaio_jobs_lock);
506 }
507 MPASS(soaio_queued == 0);
508
509 if (p->p_vmspace != myvm) {
510 mtx_unlock(&soaio_jobs_lock);
511 vmspace_switch_aio(myvm);
512 mtx_lock(&soaio_jobs_lock);
513 continue;
514 }
515
516 soaio_idle++;
517 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-",
518 soaio_lifetime);
519 soaio_idle--;
520 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) &&
521 soaio_num_procs > soaio_target_procs)
522 break;
523 }
524 soaio_num_procs--;
525 mtx_unlock(&soaio_jobs_lock);
526 free_unr(soaio_kproc_unr, id);
527 kproc_exit(0);
528 }
529
530 static void
soaio_kproc_create(void * context,int pending)531 soaio_kproc_create(void *context, int pending)
532 {
533 struct proc *p;
534 int error, id;
535
536 mtx_lock(&soaio_jobs_lock);
537 for (;;) {
538 if (soaio_num_procs < soaio_target_procs) {
539 /* Must create */
540 } else if (soaio_num_procs >= soaio_max_procs) {
541 /*
542 * Hit the limit on kernel processes, don't
543 * create another one.
544 */
545 break;
546 } else if (soaio_queued <= soaio_idle + soaio_starting) {
547 /*
548 * No more AIO jobs waiting for a process to be
549 * created, so stop.
550 */
551 break;
552 }
553 soaio_starting++;
554 mtx_unlock(&soaio_jobs_lock);
555
556 id = alloc_unr(soaio_kproc_unr);
557 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id,
558 &p, 0, 0, "soaiod%d", id);
559 if (error != 0) {
560 free_unr(soaio_kproc_unr, id);
561 mtx_lock(&soaio_jobs_lock);
562 soaio_starting--;
563 break;
564 }
565
566 mtx_lock(&soaio_jobs_lock);
567 soaio_num_procs++;
568 }
569 mtx_unlock(&soaio_jobs_lock);
570 }
571
572 void
soaio_enqueue(struct task * task)573 soaio_enqueue(struct task *task)
574 {
575
576 mtx_lock(&soaio_jobs_lock);
577 MPASS(task->ta_pending == 0);
578 task->ta_pending++;
579 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link);
580 soaio_queued++;
581 if (soaio_queued <= soaio_idle)
582 wakeup_one(&soaio_idle);
583 else if (soaio_num_procs < soaio_max_procs)
584 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task);
585 mtx_unlock(&soaio_jobs_lock);
586 }
587
588 static void
soaio_init(void)589 soaio_init(void)
590 {
591
592 soaio_lifetime = AIOD_LIFETIME_DEFAULT;
593 STAILQ_INIT(&soaio_jobs);
594 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF);
595 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL);
596 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL);
597 }
598 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL);
599
600 static __inline int
soaio_ready(struct socket * so,struct sockbuf * sb)601 soaio_ready(struct socket *so, struct sockbuf *sb)
602 {
603 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so));
604 }
605
606 static void
soaio_process_job(struct socket * so,sb_which which,struct kaiocb * job)607 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job)
608 {
609 struct ucred *td_savedcred;
610 struct thread *td;
611 struct sockbuf *sb = sobuf(so, which);
612 #ifdef MAC
613 struct file *fp = job->fd_file;
614 #endif
615 size_t cnt, done, job_total_nbytes __diagused;
616 long ru_before;
617 int error, flags;
618
619 SOCK_BUF_UNLOCK(so, which);
620 aio_switch_vmspace(job);
621 td = curthread;
622 retry:
623 td_savedcred = td->td_ucred;
624 td->td_ucred = job->cred;
625
626 job_total_nbytes = job->uiop->uio_resid + job->aio_done;
627 done = job->aio_done;
628 cnt = job->uiop->uio_resid;
629 job->uiop->uio_offset = 0;
630 job->uiop->uio_td = td;
631 flags = MSG_NBIO;
632
633 /*
634 * For resource usage accounting, only count a completed request
635 * as a single message to avoid counting multiple calls to
636 * sosend/soreceive on a blocking socket.
637 */
638
639 if (sb == &so->so_rcv) {
640 ru_before = td->td_ru.ru_msgrcv;
641 #ifdef MAC
642 error = mac_socket_check_receive(fp->f_cred, so);
643 if (error == 0)
644
645 #endif
646 error = soreceive(so, NULL, job->uiop, NULL, NULL,
647 &flags);
648 if (td->td_ru.ru_msgrcv != ru_before)
649 job->msgrcv = 1;
650 } else {
651 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
652 flags |= MSG_MORETOCOME;
653 ru_before = td->td_ru.ru_msgsnd;
654 #ifdef MAC
655 error = mac_socket_check_send(fp->f_cred, so);
656 if (error == 0)
657 #endif
658 error = sousrsend(so, NULL, job->uiop, NULL, flags,
659 job->userproc);
660 if (td->td_ru.ru_msgsnd != ru_before)
661 job->msgsnd = 1;
662 }
663
664 done += cnt - job->uiop->uio_resid;
665 job->aio_done = done;
666 td->td_ucred = td_savedcred;
667
668 if (error == EWOULDBLOCK) {
669 /*
670 * The request was either partially completed or not
671 * completed at all due to racing with a read() or
672 * write() on the socket. If the socket is
673 * non-blocking, return with any partial completion.
674 * If the socket is blocking or if no progress has
675 * been made, requeue this request at the head of the
676 * queue to try again when the socket is ready.
677 */
678 MPASS(done != job_total_nbytes);
679 SOCK_BUF_LOCK(so, which);
680 if (done == 0 || !(so->so_state & SS_NBIO)) {
681 empty_results++;
682 if (soaio_ready(so, sb)) {
683 empty_retries++;
684 SOCK_BUF_UNLOCK(so, which);
685 goto retry;
686 }
687
688 if (!aio_set_cancel_function(job, soo_aio_cancel)) {
689 SOCK_BUF_UNLOCK(so, which);
690 if (done != 0)
691 aio_complete(job, done, 0);
692 else
693 aio_cancel(job);
694 SOCK_BUF_LOCK(so, which);
695 } else {
696 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list);
697 }
698 return;
699 }
700 SOCK_BUF_UNLOCK(so, which);
701 }
702 if (done != 0 && (error == ERESTART || error == EINTR ||
703 error == EWOULDBLOCK))
704 error = 0;
705 if (error)
706 aio_complete(job, -1, error);
707 else
708 aio_complete(job, done, 0);
709 SOCK_BUF_LOCK(so, which);
710 }
711
712 static void
soaio_process_sb(struct socket * so,sb_which which)713 soaio_process_sb(struct socket *so, sb_which which)
714 {
715 struct kaiocb *job;
716 struct sockbuf *sb = sobuf(so, which);
717
718 CURVNET_SET(so->so_vnet);
719 SOCK_BUF_LOCK(so, which);
720 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) {
721 job = TAILQ_FIRST(&sb->sb_aiojobq);
722 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
723 if (!aio_clear_cancel_function(job))
724 continue;
725
726 soaio_process_job(so, which, job);
727 }
728
729 /*
730 * If there are still pending requests, the socket must not be
731 * ready so set SB_AIO to request a wakeup when the socket
732 * becomes ready.
733 */
734 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
735 sb->sb_flags |= SB_AIO;
736 sb->sb_flags &= ~SB_AIO_RUNNING;
737 SOCK_BUF_UNLOCK(so, which);
738
739 sorele(so);
740 CURVNET_RESTORE();
741 }
742
743 void
soaio_rcv(void * context,int pending)744 soaio_rcv(void *context, int pending)
745 {
746 struct socket *so;
747
748 so = context;
749 soaio_process_sb(so, SO_RCV);
750 }
751
752 void
soaio_snd(void * context,int pending)753 soaio_snd(void *context, int pending)
754 {
755 struct socket *so;
756
757 so = context;
758 soaio_process_sb(so, SO_SND);
759 }
760
761 void
sowakeup_aio(struct socket * so,sb_which which)762 sowakeup_aio(struct socket *so, sb_which which)
763 {
764 struct sockbuf *sb = sobuf(so, which);
765
766 SOCK_BUF_LOCK_ASSERT(so, which);
767
768 sb->sb_flags &= ~SB_AIO;
769 if (sb->sb_flags & SB_AIO_RUNNING)
770 return;
771 sb->sb_flags |= SB_AIO_RUNNING;
772 soref(so);
773 soaio_enqueue(&sb->sb_aiotask);
774 }
775
776 static void
soo_aio_cancel(struct kaiocb * job)777 soo_aio_cancel(struct kaiocb *job)
778 {
779 struct socket *so;
780 struct sockbuf *sb;
781 long done;
782 int opcode;
783 sb_which which;
784
785 so = job->fd_file->f_data;
786 opcode = job->uaiocb.aio_lio_opcode;
787 if (opcode & LIO_READ) {
788 sb = &so->so_rcv;
789 which = SO_RCV;
790 } else {
791 MPASS(opcode & LIO_WRITE);
792 sb = &so->so_snd;
793 which = SO_SND;
794 }
795
796 SOCK_BUF_LOCK(so, which);
797 if (!aio_cancel_cleared(job))
798 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
799 if (TAILQ_EMPTY(&sb->sb_aiojobq))
800 sb->sb_flags &= ~SB_AIO;
801 SOCK_BUF_UNLOCK(so, which);
802
803 done = job->aio_done;
804 if (done != 0)
805 aio_complete(job, done, 0);
806 else
807 aio_cancel(job);
808 }
809
810 static int
soo_aio_queue(struct file * fp,struct kaiocb * job)811 soo_aio_queue(struct file *fp, struct kaiocb *job)
812 {
813 struct socket *so;
814 struct sockbuf *sb;
815 sb_which which;
816 int error;
817
818 so = fp->f_data;
819 error = so->so_proto->pr_aio_queue(so, job);
820 if (error == 0)
821 return (0);
822
823 /* Lock through the socket, since this may be a listening socket. */
824 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) {
825 case LIO_READ:
826 SOCK_RECVBUF_LOCK(so);
827 sb = &so->so_rcv;
828 which = SO_RCV;
829 break;
830 case LIO_WRITE:
831 SOCK_SENDBUF_LOCK(so);
832 sb = &so->so_snd;
833 which = SO_SND;
834 break;
835 default:
836 return (EINVAL);
837 }
838
839 if (SOLISTENING(so)) {
840 SOCK_BUF_UNLOCK(so, which);
841 return (EINVAL);
842 }
843
844 if (!aio_set_cancel_function(job, soo_aio_cancel))
845 panic("new job was cancelled");
846 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list);
847 if (!(sb->sb_flags & SB_AIO_RUNNING)) {
848 if (soaio_ready(so, sb))
849 sowakeup_aio(so, which);
850 else
851 sb->sb_flags |= SB_AIO;
852 }
853 SOCK_BUF_UNLOCK(so, which);
854 return (0);
855 }
856