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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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