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_fill_kinfo_t soo_fill_kinfo;
97 static fo_aio_queue_t soo_aio_queue;
98
99 static void soo_aio_cancel(struct kaiocb *job);
100
101 struct fileops socketops = {
102 .fo_read = soo_read,
103 .fo_write = soo_write,
104 .fo_truncate = invfo_truncate,
105 .fo_ioctl = soo_ioctl,
106 .fo_poll = soo_poll,
107 .fo_kqfilter = soo_kqfilter,
108 .fo_stat = soo_stat,
109 .fo_close = soo_close,
110 .fo_chmod = invfo_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 (sopoll(so, events, fp->f_cred, td));
294 }
295
296 static int
soo_stat(struct file * fp,struct stat * ub,struct ucred * active_cred)297 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred)
298 {
299 struct socket *so = fp->f_data;
300 int error = 0;
301
302 bzero((caddr_t)ub, sizeof (*ub));
303 ub->st_mode = S_IFSOCK;
304 #ifdef MAC
305 error = mac_socket_check_stat(active_cred, so);
306 if (error)
307 return (error);
308 #endif
309 SOCK_LOCK(so);
310 if (!SOLISTENING(so)) {
311 struct sockbuf *sb;
312
313 /*
314 * If SBS_CANTRCVMORE is set, but there's still data left
315 * in the receive buffer, the socket is still readable.
316 */
317 sb = &so->so_rcv;
318 SOCK_RECVBUF_LOCK(so);
319 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb))
320 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH;
321 ub->st_size = sbavail(sb) - sb->sb_ctl;
322 SOCK_RECVBUF_UNLOCK(so);
323
324 sb = &so->so_snd;
325 SOCK_SENDBUF_LOCK(so);
326 if ((sb->sb_state & SBS_CANTSENDMORE) == 0)
327 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
328 SOCK_SENDBUF_UNLOCK(so);
329 }
330 ub->st_uid = so->so_cred->cr_uid;
331 ub->st_gid = so->so_cred->cr_gid;
332 if (so->so_proto->pr_sense)
333 error = so->so_proto->pr_sense(so, ub);
334 SOCK_UNLOCK(so);
335 return (error);
336 }
337
338 /*
339 * API socket close on file pointer. We call soclose() to close the socket
340 * (including initiating closing protocols). soclose() will sorele() the
341 * file reference but the actual socket will not go away until the socket's
342 * ref count hits 0.
343 */
344 static int
soo_close(struct file * fp,struct thread * td)345 soo_close(struct file *fp, struct thread *td)
346 {
347 int error = 0;
348 struct socket *so;
349
350 so = fp->f_data;
351 fp->f_ops = &badfileops;
352 fp->f_data = NULL;
353
354 if (so)
355 error = soclose(so);
356 return (error);
357 }
358
359 static int
soo_fill_kinfo(struct file * fp,struct kinfo_file * kif,struct filedesc * fdp)360 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
361 {
362 struct sockaddr *sa;
363 struct inpcb *inpcb;
364 struct unpcb *unpcb;
365 struct socket *so;
366 int error;
367
368 kif->kf_type = KF_TYPE_SOCKET;
369 so = fp->f_data;
370 CURVNET_SET(so->so_vnet);
371 kif->kf_un.kf_sock.kf_sock_domain0 =
372 so->so_proto->pr_domain->dom_family;
373 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type;
374 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol;
375 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb;
376 switch (kif->kf_un.kf_sock.kf_sock_domain0) {
377 case AF_INET:
378 case AF_INET6:
379 if (so->so_pcb != NULL) {
380 inpcb = (struct inpcb *)(so->so_pcb);
381 kif->kf_un.kf_sock.kf_sock_inpcb =
382 (uintptr_t)inpcb->inp_ppcb;
383 }
384 kif->kf_un.kf_sock.kf_sock_rcv_sb_state =
385 so->so_rcv.sb_state;
386 kif->kf_un.kf_sock.kf_sock_snd_sb_state =
387 so->so_snd.sb_state;
388 kif->kf_un.kf_sock.kf_sock_sendq =
389 sbused(&so->so_snd);
390 kif->kf_un.kf_sock.kf_sock_recvq =
391 sbused(&so->so_rcv);
392 break;
393 case AF_UNIX:
394 if (so->so_pcb != NULL) {
395 unpcb = (struct unpcb *)(so->so_pcb);
396 if (unpcb->unp_conn) {
397 kif->kf_un.kf_sock.kf_sock_unpconn =
398 (uintptr_t)unpcb->unp_conn;
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 }
408 }
409 break;
410 }
411 error = so->so_proto->pr_sockaddr(so, &sa);
412 if (error == 0 &&
413 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) {
414 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len);
415 free(sa, M_SONAME);
416 }
417 error = so->so_proto->pr_peeraddr(so, &sa);
418 if (error == 0 &&
419 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) {
420 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len);
421 free(sa, M_SONAME);
422 }
423 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name,
424 sizeof(kif->kf_path));
425 CURVNET_RESTORE();
426 return (0);
427 }
428
429 /*
430 * Use the 'backend3' field in AIO jobs to store the amount of data
431 * completed by the AIO job so far.
432 */
433 #define aio_done backend3
434
435 static STAILQ_HEAD(, task) soaio_jobs;
436 static struct mtx soaio_jobs_lock;
437 static struct task soaio_kproc_task;
438 static int soaio_starting, soaio_idle, soaio_queued;
439 static struct unrhdr *soaio_kproc_unr;
440
441 static int soaio_max_procs = MAX_AIO_PROCS;
442 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0,
443 "Maximum number of kernel processes to use for async socket IO");
444
445 static int soaio_num_procs;
446 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0,
447 "Number of active kernel processes for async socket IO");
448
449 static int soaio_target_procs = TARGET_AIO_PROCS;
450 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD,
451 &soaio_target_procs, 0,
452 "Preferred number of ready kernel processes for async socket IO");
453
454 static int soaio_lifetime;
455 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0,
456 "Maximum lifetime for idle aiod");
457
458 static void
soaio_kproc_loop(void * arg)459 soaio_kproc_loop(void *arg)
460 {
461 struct proc *p;
462 struct vmspace *myvm;
463 struct task *task;
464 int error, id, pending;
465
466 id = (intptr_t)arg;
467
468 /*
469 * Grab an extra reference on the daemon's vmspace so that it
470 * doesn't get freed by jobs that switch to a different
471 * vmspace.
472 */
473 p = curproc;
474 myvm = vmspace_acquire_ref(p);
475
476 mtx_lock(&soaio_jobs_lock);
477 MPASS(soaio_starting > 0);
478 soaio_starting--;
479 for (;;) {
480 while (!STAILQ_EMPTY(&soaio_jobs)) {
481 task = STAILQ_FIRST(&soaio_jobs);
482 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link);
483 soaio_queued--;
484 pending = task->ta_pending;
485 task->ta_pending = 0;
486 mtx_unlock(&soaio_jobs_lock);
487
488 task->ta_func(task->ta_context, pending);
489
490 mtx_lock(&soaio_jobs_lock);
491 }
492 MPASS(soaio_queued == 0);
493
494 if (p->p_vmspace != myvm) {
495 mtx_unlock(&soaio_jobs_lock);
496 vmspace_switch_aio(myvm);
497 mtx_lock(&soaio_jobs_lock);
498 continue;
499 }
500
501 soaio_idle++;
502 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-",
503 soaio_lifetime);
504 soaio_idle--;
505 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) &&
506 soaio_num_procs > soaio_target_procs)
507 break;
508 }
509 soaio_num_procs--;
510 mtx_unlock(&soaio_jobs_lock);
511 free_unr(soaio_kproc_unr, id);
512 kproc_exit(0);
513 }
514
515 static void
soaio_kproc_create(void * context,int pending)516 soaio_kproc_create(void *context, int pending)
517 {
518 struct proc *p;
519 int error, id;
520
521 mtx_lock(&soaio_jobs_lock);
522 for (;;) {
523 if (soaio_num_procs < soaio_target_procs) {
524 /* Must create */
525 } else if (soaio_num_procs >= soaio_max_procs) {
526 /*
527 * Hit the limit on kernel processes, don't
528 * create another one.
529 */
530 break;
531 } else if (soaio_queued <= soaio_idle + soaio_starting) {
532 /*
533 * No more AIO jobs waiting for a process to be
534 * created, so stop.
535 */
536 break;
537 }
538 soaio_starting++;
539 mtx_unlock(&soaio_jobs_lock);
540
541 id = alloc_unr(soaio_kproc_unr);
542 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id,
543 &p, 0, 0, "soaiod%d", id);
544 if (error != 0) {
545 free_unr(soaio_kproc_unr, id);
546 mtx_lock(&soaio_jobs_lock);
547 soaio_starting--;
548 break;
549 }
550
551 mtx_lock(&soaio_jobs_lock);
552 soaio_num_procs++;
553 }
554 mtx_unlock(&soaio_jobs_lock);
555 }
556
557 void
soaio_enqueue(struct task * task)558 soaio_enqueue(struct task *task)
559 {
560
561 mtx_lock(&soaio_jobs_lock);
562 MPASS(task->ta_pending == 0);
563 task->ta_pending++;
564 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link);
565 soaio_queued++;
566 if (soaio_queued <= soaio_idle)
567 wakeup_one(&soaio_idle);
568 else if (soaio_num_procs < soaio_max_procs)
569 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task);
570 mtx_unlock(&soaio_jobs_lock);
571 }
572
573 static void
soaio_init(void)574 soaio_init(void)
575 {
576
577 soaio_lifetime = AIOD_LIFETIME_DEFAULT;
578 STAILQ_INIT(&soaio_jobs);
579 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF);
580 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL);
581 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL);
582 }
583 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL);
584
585 static __inline int
soaio_ready(struct socket * so,struct sockbuf * sb)586 soaio_ready(struct socket *so, struct sockbuf *sb)
587 {
588 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so));
589 }
590
591 static void
soaio_process_job(struct socket * so,sb_which which,struct kaiocb * job)592 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job)
593 {
594 struct ucred *td_savedcred;
595 struct thread *td;
596 struct sockbuf *sb = sobuf(so, which);
597 #ifdef MAC
598 struct file *fp = job->fd_file;
599 #endif
600 size_t cnt, done, job_total_nbytes __diagused;
601 long ru_before;
602 int error, flags;
603
604 SOCK_BUF_UNLOCK(so, which);
605 aio_switch_vmspace(job);
606 td = curthread;
607 retry:
608 td_savedcred = td->td_ucred;
609 td->td_ucred = job->cred;
610
611 job_total_nbytes = job->uiop->uio_resid + job->aio_done;
612 done = job->aio_done;
613 cnt = job->uiop->uio_resid;
614 job->uiop->uio_offset = 0;
615 job->uiop->uio_td = td;
616 flags = MSG_NBIO;
617
618 /*
619 * For resource usage accounting, only count a completed request
620 * as a single message to avoid counting multiple calls to
621 * sosend/soreceive on a blocking socket.
622 */
623
624 if (sb == &so->so_rcv) {
625 ru_before = td->td_ru.ru_msgrcv;
626 #ifdef MAC
627 error = mac_socket_check_receive(fp->f_cred, so);
628 if (error == 0)
629
630 #endif
631 error = soreceive(so, NULL, job->uiop, NULL, NULL,
632 &flags);
633 if (td->td_ru.ru_msgrcv != ru_before)
634 job->msgrcv = 1;
635 } else {
636 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
637 flags |= MSG_MORETOCOME;
638 ru_before = td->td_ru.ru_msgsnd;
639 #ifdef MAC
640 error = mac_socket_check_send(fp->f_cred, so);
641 if (error == 0)
642 #endif
643 error = sousrsend(so, NULL, job->uiop, NULL, flags,
644 job->userproc);
645 if (td->td_ru.ru_msgsnd != ru_before)
646 job->msgsnd = 1;
647 }
648
649 done += cnt - job->uiop->uio_resid;
650 job->aio_done = done;
651 td->td_ucred = td_savedcred;
652
653 if (error == EWOULDBLOCK) {
654 /*
655 * The request was either partially completed or not
656 * completed at all due to racing with a read() or
657 * write() on the socket. If the socket is
658 * non-blocking, return with any partial completion.
659 * If the socket is blocking or if no progress has
660 * been made, requeue this request at the head of the
661 * queue to try again when the socket is ready.
662 */
663 MPASS(done != job_total_nbytes);
664 SOCK_BUF_LOCK(so, which);
665 if (done == 0 || !(so->so_state & SS_NBIO)) {
666 empty_results++;
667 if (soaio_ready(so, sb)) {
668 empty_retries++;
669 SOCK_BUF_UNLOCK(so, which);
670 goto retry;
671 }
672
673 if (!aio_set_cancel_function(job, soo_aio_cancel)) {
674 SOCK_BUF_UNLOCK(so, which);
675 if (done != 0)
676 aio_complete(job, done, 0);
677 else
678 aio_cancel(job);
679 SOCK_BUF_LOCK(so, which);
680 } else {
681 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list);
682 }
683 return;
684 }
685 SOCK_BUF_UNLOCK(so, which);
686 }
687 if (done != 0 && (error == ERESTART || error == EINTR ||
688 error == EWOULDBLOCK))
689 error = 0;
690 if (error)
691 aio_complete(job, -1, error);
692 else
693 aio_complete(job, done, 0);
694 SOCK_BUF_LOCK(so, which);
695 }
696
697 static void
soaio_process_sb(struct socket * so,sb_which which)698 soaio_process_sb(struct socket *so, sb_which which)
699 {
700 struct kaiocb *job;
701 struct sockbuf *sb = sobuf(so, which);
702
703 CURVNET_SET(so->so_vnet);
704 SOCK_BUF_LOCK(so, which);
705 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) {
706 job = TAILQ_FIRST(&sb->sb_aiojobq);
707 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
708 if (!aio_clear_cancel_function(job))
709 continue;
710
711 soaio_process_job(so, which, job);
712 }
713
714 /*
715 * If there are still pending requests, the socket must not be
716 * ready so set SB_AIO to request a wakeup when the socket
717 * becomes ready.
718 */
719 if (!TAILQ_EMPTY(&sb->sb_aiojobq))
720 sb->sb_flags |= SB_AIO;
721 sb->sb_flags &= ~SB_AIO_RUNNING;
722 SOCK_BUF_UNLOCK(so, which);
723
724 sorele(so);
725 CURVNET_RESTORE();
726 }
727
728 void
soaio_rcv(void * context,int pending)729 soaio_rcv(void *context, int pending)
730 {
731 struct socket *so;
732
733 so = context;
734 soaio_process_sb(so, SO_RCV);
735 }
736
737 void
soaio_snd(void * context,int pending)738 soaio_snd(void *context, int pending)
739 {
740 struct socket *so;
741
742 so = context;
743 soaio_process_sb(so, SO_SND);
744 }
745
746 void
sowakeup_aio(struct socket * so,sb_which which)747 sowakeup_aio(struct socket *so, sb_which which)
748 {
749 struct sockbuf *sb = sobuf(so, which);
750
751 SOCK_BUF_LOCK_ASSERT(so, which);
752
753 sb->sb_flags &= ~SB_AIO;
754 if (sb->sb_flags & SB_AIO_RUNNING)
755 return;
756 sb->sb_flags |= SB_AIO_RUNNING;
757 soref(so);
758 soaio_enqueue(&sb->sb_aiotask);
759 }
760
761 static void
soo_aio_cancel(struct kaiocb * job)762 soo_aio_cancel(struct kaiocb *job)
763 {
764 struct socket *so;
765 struct sockbuf *sb;
766 long done;
767 int opcode;
768 sb_which which;
769
770 so = job->fd_file->f_data;
771 opcode = job->uaiocb.aio_lio_opcode;
772 if (opcode & LIO_READ) {
773 sb = &so->so_rcv;
774 which = SO_RCV;
775 } else {
776 MPASS(opcode & LIO_WRITE);
777 sb = &so->so_snd;
778 which = SO_SND;
779 }
780
781 SOCK_BUF_LOCK(so, which);
782 if (!aio_cancel_cleared(job))
783 TAILQ_REMOVE(&sb->sb_aiojobq, job, list);
784 if (TAILQ_EMPTY(&sb->sb_aiojobq))
785 sb->sb_flags &= ~SB_AIO;
786 SOCK_BUF_UNLOCK(so, which);
787
788 done = job->aio_done;
789 if (done != 0)
790 aio_complete(job, done, 0);
791 else
792 aio_cancel(job);
793 }
794
795 static int
soo_aio_queue(struct file * fp,struct kaiocb * job)796 soo_aio_queue(struct file *fp, struct kaiocb *job)
797 {
798 struct socket *so;
799 struct sockbuf *sb;
800 sb_which which;
801 int error;
802
803 so = fp->f_data;
804 error = so->so_proto->pr_aio_queue(so, job);
805 if (error == 0)
806 return (0);
807
808 /* Lock through the socket, since this may be a listening socket. */
809 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) {
810 case LIO_READ:
811 SOCK_RECVBUF_LOCK(so);
812 sb = &so->so_rcv;
813 which = SO_RCV;
814 break;
815 case LIO_WRITE:
816 SOCK_SENDBUF_LOCK(so);
817 sb = &so->so_snd;
818 which = SO_SND;
819 break;
820 default:
821 return (EINVAL);
822 }
823
824 if (SOLISTENING(so)) {
825 SOCK_BUF_UNLOCK(so, which);
826 return (EINVAL);
827 }
828
829 if (!aio_set_cancel_function(job, soo_aio_cancel))
830 panic("new job was cancelled");
831 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list);
832 if (!(sb->sb_flags & SB_AIO_RUNNING)) {
833 if (soaio_ready(so, sb))
834 sowakeup_aio(so, which);
835 else
836 sb->sb_flags |= SB_AIO;
837 }
838 SOCK_BUF_UNLOCK(so, which);
839 return (0);
840 }
841