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 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/aio.h> 40 #include <sys/domain.h> 41 #include <sys/file.h> 42 #include <sys/filedesc.h> 43 #include <sys/kernel.h> 44 #include <sys/kthread.h> 45 #include <sys/malloc.h> 46 #include <sys/proc.h> 47 #include <sys/protosw.h> 48 #include <sys/sigio.h> 49 #include <sys/signal.h> 50 #include <sys/signalvar.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/filio.h> /* XXX */ 54 #include <sys/sockio.h> 55 #include <sys/stat.h> 56 #include <sys/sysctl.h> 57 #include <sys/sysproto.h> 58 #include <sys/taskqueue.h> 59 #include <sys/uio.h> 60 #include <sys/ucred.h> 61 #include <sys/un.h> 62 #include <sys/unpcb.h> 63 #include <sys/user.h> 64 65 #include <net/if.h> 66 #include <net/if_var.h> 67 #include <net/route.h> 68 #include <net/vnet.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_pcb.h> 72 73 #include <security/mac/mac_framework.h> 74 75 #include <vm/vm.h> 76 #include <vm/pmap.h> 77 #include <vm/vm_extern.h> 78 #include <vm/vm_map.h> 79 80 static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 81 "socket AIO stats"); 82 83 static int empty_results; 84 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results, 85 0, "socket operation returned EAGAIN"); 86 87 static int empty_retries; 88 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries, 89 0, "socket operation retries"); 90 91 static fo_rdwr_t soo_read; 92 static fo_rdwr_t soo_write; 93 static fo_ioctl_t soo_ioctl; 94 static fo_poll_t soo_poll; 95 extern fo_kqfilter_t soo_kqfilter; 96 static fo_stat_t soo_stat; 97 static fo_close_t soo_close; 98 static fo_fill_kinfo_t soo_fill_kinfo; 99 static fo_aio_queue_t soo_aio_queue; 100 101 static void soo_aio_cancel(struct kaiocb *job); 102 103 struct fileops socketops = { 104 .fo_read = soo_read, 105 .fo_write = soo_write, 106 .fo_truncate = invfo_truncate, 107 .fo_ioctl = soo_ioctl, 108 .fo_poll = soo_poll, 109 .fo_kqfilter = soo_kqfilter, 110 .fo_stat = soo_stat, 111 .fo_close = soo_close, 112 .fo_chmod = invfo_chmod, 113 .fo_chown = invfo_chown, 114 .fo_sendfile = invfo_sendfile, 115 .fo_fill_kinfo = soo_fill_kinfo, 116 .fo_aio_queue = soo_aio_queue, 117 .fo_flags = DFLAG_PASSABLE 118 }; 119 120 static int 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 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 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 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 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 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 361 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 362 { 363 struct sockaddr *sa; 364 struct inpcb *inpcb; 365 struct unpcb *unpcb; 366 struct socket *so; 367 int error; 368 369 kif->kf_type = KF_TYPE_SOCKET; 370 so = fp->f_data; 371 CURVNET_SET(so->so_vnet); 372 kif->kf_un.kf_sock.kf_sock_domain0 = 373 so->so_proto->pr_domain->dom_family; 374 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 375 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 376 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 377 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 378 case AF_INET: 379 case AF_INET6: 380 if (so->so_pcb != NULL) { 381 inpcb = (struct inpcb *)(so->so_pcb); 382 kif->kf_un.kf_sock.kf_sock_inpcb = 383 (uintptr_t)inpcb->inp_ppcb; 384 } 385 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 386 so->so_rcv.sb_state; 387 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 388 so->so_snd.sb_state; 389 kif->kf_un.kf_sock.kf_sock_sendq = 390 sbused(&so->so_snd); 391 kif->kf_un.kf_sock.kf_sock_recvq = 392 sbused(&so->so_rcv); 393 break; 394 case AF_UNIX: 395 if (so->so_pcb != NULL) { 396 unpcb = (struct unpcb *)(so->so_pcb); 397 if (unpcb->unp_conn) { 398 kif->kf_un.kf_sock.kf_sock_unpconn = 399 (uintptr_t)unpcb->unp_conn; 400 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 401 so->so_rcv.sb_state; 402 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 403 so->so_snd.sb_state; 404 kif->kf_un.kf_sock.kf_sock_sendq = 405 sbused(&so->so_snd); 406 kif->kf_un.kf_sock.kf_sock_recvq = 407 sbused(&so->so_rcv); 408 } 409 } 410 break; 411 } 412 error = so->so_proto->pr_sockaddr(so, &sa); 413 if (error == 0 && 414 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 415 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 416 free(sa, M_SONAME); 417 } 418 error = so->so_proto->pr_peeraddr(so, &sa); 419 if (error == 0 && 420 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 421 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 422 free(sa, M_SONAME); 423 } 424 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 425 sizeof(kif->kf_path)); 426 CURVNET_RESTORE(); 427 return (0); 428 } 429 430 /* 431 * Use the 'backend3' field in AIO jobs to store the amount of data 432 * completed by the AIO job so far. 433 */ 434 #define aio_done backend3 435 436 static STAILQ_HEAD(, task) soaio_jobs; 437 static struct mtx soaio_jobs_lock; 438 static struct task soaio_kproc_task; 439 static int soaio_starting, soaio_idle, soaio_queued; 440 static struct unrhdr *soaio_kproc_unr; 441 442 static int soaio_max_procs = MAX_AIO_PROCS; 443 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 444 "Maximum number of kernel processes to use for async socket IO"); 445 446 static int soaio_num_procs; 447 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 448 "Number of active kernel processes for async socket IO"); 449 450 static int soaio_target_procs = TARGET_AIO_PROCS; 451 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 452 &soaio_target_procs, 0, 453 "Preferred number of ready kernel processes for async socket IO"); 454 455 static int soaio_lifetime; 456 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 457 "Maximum lifetime for idle aiod"); 458 459 static void 460 soaio_kproc_loop(void *arg) 461 { 462 struct proc *p; 463 struct vmspace *myvm; 464 struct task *task; 465 int error, id, pending; 466 467 id = (intptr_t)arg; 468 469 /* 470 * Grab an extra reference on the daemon's vmspace so that it 471 * doesn't get freed by jobs that switch to a different 472 * vmspace. 473 */ 474 p = curproc; 475 myvm = vmspace_acquire_ref(p); 476 477 mtx_lock(&soaio_jobs_lock); 478 MPASS(soaio_starting > 0); 479 soaio_starting--; 480 for (;;) { 481 while (!STAILQ_EMPTY(&soaio_jobs)) { 482 task = STAILQ_FIRST(&soaio_jobs); 483 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 484 soaio_queued--; 485 pending = task->ta_pending; 486 task->ta_pending = 0; 487 mtx_unlock(&soaio_jobs_lock); 488 489 task->ta_func(task->ta_context, pending); 490 491 mtx_lock(&soaio_jobs_lock); 492 } 493 MPASS(soaio_queued == 0); 494 495 if (p->p_vmspace != myvm) { 496 mtx_unlock(&soaio_jobs_lock); 497 vmspace_switch_aio(myvm); 498 mtx_lock(&soaio_jobs_lock); 499 continue; 500 } 501 502 soaio_idle++; 503 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 504 soaio_lifetime); 505 soaio_idle--; 506 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 507 soaio_num_procs > soaio_target_procs) 508 break; 509 } 510 soaio_num_procs--; 511 mtx_unlock(&soaio_jobs_lock); 512 free_unr(soaio_kproc_unr, id); 513 kproc_exit(0); 514 } 515 516 static void 517 soaio_kproc_create(void *context, int pending) 518 { 519 struct proc *p; 520 int error, id; 521 522 mtx_lock(&soaio_jobs_lock); 523 for (;;) { 524 if (soaio_num_procs < soaio_target_procs) { 525 /* Must create */ 526 } else if (soaio_num_procs >= soaio_max_procs) { 527 /* 528 * Hit the limit on kernel processes, don't 529 * create another one. 530 */ 531 break; 532 } else if (soaio_queued <= soaio_idle + soaio_starting) { 533 /* 534 * No more AIO jobs waiting for a process to be 535 * created, so stop. 536 */ 537 break; 538 } 539 soaio_starting++; 540 mtx_unlock(&soaio_jobs_lock); 541 542 id = alloc_unr(soaio_kproc_unr); 543 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 544 &p, 0, 0, "soaiod%d", id); 545 if (error != 0) { 546 free_unr(soaio_kproc_unr, id); 547 mtx_lock(&soaio_jobs_lock); 548 soaio_starting--; 549 break; 550 } 551 552 mtx_lock(&soaio_jobs_lock); 553 soaio_num_procs++; 554 } 555 mtx_unlock(&soaio_jobs_lock); 556 } 557 558 void 559 soaio_enqueue(struct task *task) 560 { 561 562 mtx_lock(&soaio_jobs_lock); 563 MPASS(task->ta_pending == 0); 564 task->ta_pending++; 565 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 566 soaio_queued++; 567 if (soaio_queued <= soaio_idle) 568 wakeup_one(&soaio_idle); 569 else if (soaio_num_procs < soaio_max_procs) 570 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 571 mtx_unlock(&soaio_jobs_lock); 572 } 573 574 static void 575 soaio_init(void) 576 { 577 578 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 579 STAILQ_INIT(&soaio_jobs); 580 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 581 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 582 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 583 } 584 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 585 586 static __inline int 587 soaio_ready(struct socket *so, struct sockbuf *sb) 588 { 589 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 590 } 591 592 static void 593 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job) 594 { 595 struct ucred *td_savedcred; 596 struct thread *td; 597 struct sockbuf *sb = sobuf(so, which); 598 #ifdef MAC 599 struct file *fp = job->fd_file; 600 #endif 601 size_t cnt, done, job_total_nbytes __diagused; 602 long ru_before; 603 int error, flags; 604 605 SOCK_BUF_UNLOCK(so, which); 606 aio_switch_vmspace(job); 607 td = curthread; 608 retry: 609 td_savedcred = td->td_ucred; 610 td->td_ucred = job->cred; 611 612 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 613 done = job->aio_done; 614 cnt = job->uiop->uio_resid; 615 job->uiop->uio_offset = 0; 616 job->uiop->uio_td = td; 617 flags = MSG_NBIO; 618 619 /* 620 * For resource usage accounting, only count a completed request 621 * as a single message to avoid counting multiple calls to 622 * sosend/soreceive on a blocking socket. 623 */ 624 625 if (sb == &so->so_rcv) { 626 ru_before = td->td_ru.ru_msgrcv; 627 #ifdef MAC 628 error = mac_socket_check_receive(fp->f_cred, so); 629 if (error == 0) 630 631 #endif 632 error = soreceive(so, NULL, job->uiop, NULL, NULL, 633 &flags); 634 if (td->td_ru.ru_msgrcv != ru_before) 635 job->msgrcv = 1; 636 } else { 637 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 638 flags |= MSG_MORETOCOME; 639 ru_before = td->td_ru.ru_msgsnd; 640 #ifdef MAC 641 error = mac_socket_check_send(fp->f_cred, so); 642 if (error == 0) 643 #endif 644 error = sousrsend(so, NULL, job->uiop, NULL, flags, 645 job->userproc); 646 if (td->td_ru.ru_msgsnd != ru_before) 647 job->msgsnd = 1; 648 } 649 650 done += cnt - job->uiop->uio_resid; 651 job->aio_done = done; 652 td->td_ucred = td_savedcred; 653 654 if (error == EWOULDBLOCK) { 655 /* 656 * The request was either partially completed or not 657 * completed at all due to racing with a read() or 658 * write() on the socket. If the socket is 659 * non-blocking, return with any partial completion. 660 * If the socket is blocking or if no progress has 661 * been made, requeue this request at the head of the 662 * queue to try again when the socket is ready. 663 */ 664 MPASS(done != job_total_nbytes); 665 SOCK_BUF_LOCK(so, which); 666 if (done == 0 || !(so->so_state & SS_NBIO)) { 667 empty_results++; 668 if (soaio_ready(so, sb)) { 669 empty_retries++; 670 SOCK_BUF_UNLOCK(so, which); 671 goto retry; 672 } 673 674 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 675 SOCK_BUF_UNLOCK(so, which); 676 if (done != 0) 677 aio_complete(job, done, 0); 678 else 679 aio_cancel(job); 680 SOCK_BUF_LOCK(so, which); 681 } else { 682 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 683 } 684 return; 685 } 686 SOCK_BUF_UNLOCK(so, which); 687 } 688 if (done != 0 && (error == ERESTART || error == EINTR || 689 error == EWOULDBLOCK)) 690 error = 0; 691 if (error) 692 aio_complete(job, -1, error); 693 else 694 aio_complete(job, done, 0); 695 SOCK_BUF_LOCK(so, which); 696 } 697 698 static void 699 soaio_process_sb(struct socket *so, sb_which which) 700 { 701 struct kaiocb *job; 702 struct sockbuf *sb = sobuf(so, which); 703 704 CURVNET_SET(so->so_vnet); 705 SOCK_BUF_LOCK(so, which); 706 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 707 job = TAILQ_FIRST(&sb->sb_aiojobq); 708 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 709 if (!aio_clear_cancel_function(job)) 710 continue; 711 712 soaio_process_job(so, which, job); 713 } 714 715 /* 716 * If there are still pending requests, the socket must not be 717 * ready so set SB_AIO to request a wakeup when the socket 718 * becomes ready. 719 */ 720 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 721 sb->sb_flags |= SB_AIO; 722 sb->sb_flags &= ~SB_AIO_RUNNING; 723 SOCK_BUF_UNLOCK(so, which); 724 725 sorele(so); 726 CURVNET_RESTORE(); 727 } 728 729 void 730 soaio_rcv(void *context, int pending) 731 { 732 struct socket *so; 733 734 so = context; 735 soaio_process_sb(so, SO_RCV); 736 } 737 738 void 739 soaio_snd(void *context, int pending) 740 { 741 struct socket *so; 742 743 so = context; 744 soaio_process_sb(so, SO_SND); 745 } 746 747 void 748 sowakeup_aio(struct socket *so, sb_which which) 749 { 750 struct sockbuf *sb = sobuf(so, which); 751 752 SOCK_BUF_LOCK_ASSERT(so, which); 753 754 sb->sb_flags &= ~SB_AIO; 755 if (sb->sb_flags & SB_AIO_RUNNING) 756 return; 757 sb->sb_flags |= SB_AIO_RUNNING; 758 soref(so); 759 soaio_enqueue(&sb->sb_aiotask); 760 } 761 762 static void 763 soo_aio_cancel(struct kaiocb *job) 764 { 765 struct socket *so; 766 struct sockbuf *sb; 767 long done; 768 int opcode; 769 sb_which which; 770 771 so = job->fd_file->f_data; 772 opcode = job->uaiocb.aio_lio_opcode; 773 if (opcode & LIO_READ) { 774 sb = &so->so_rcv; 775 which = SO_RCV; 776 } else { 777 MPASS(opcode & LIO_WRITE); 778 sb = &so->so_snd; 779 which = SO_SND; 780 } 781 782 SOCK_BUF_LOCK(so, which); 783 if (!aio_cancel_cleared(job)) 784 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 785 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 786 sb->sb_flags &= ~SB_AIO; 787 SOCK_BUF_UNLOCK(so, which); 788 789 done = job->aio_done; 790 if (done != 0) 791 aio_complete(job, done, 0); 792 else 793 aio_cancel(job); 794 } 795 796 static int 797 soo_aio_queue(struct file *fp, struct kaiocb *job) 798 { 799 struct socket *so; 800 struct sockbuf *sb; 801 sb_which which; 802 int error; 803 804 so = fp->f_data; 805 error = so->so_proto->pr_aio_queue(so, job); 806 if (error == 0) 807 return (0); 808 809 /* Lock through the socket, since this may be a listening socket. */ 810 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 811 case LIO_READ: 812 SOCK_RECVBUF_LOCK(so); 813 sb = &so->so_rcv; 814 which = SO_RCV; 815 break; 816 case LIO_WRITE: 817 SOCK_SENDBUF_LOCK(so); 818 sb = &so->so_snd; 819 which = SO_SND; 820 break; 821 default: 822 return (EINVAL); 823 } 824 825 if (SOLISTENING(so)) { 826 SOCK_BUF_UNLOCK(so, which); 827 return (EINVAL); 828 } 829 830 if (!aio_set_cancel_function(job, soo_aio_cancel)) 831 panic("new job was cancelled"); 832 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 833 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 834 if (soaio_ready(so, sb)) 835 sowakeup_aio(so, which); 836 else 837 sb->sb_flags |= SB_AIO; 838 } 839 SOCK_BUF_UNLOCK(so, which); 840 return (0); 841 } 842