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