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 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 (sopoll(so, events, fp->f_cred, td)); 294 } 295 296 static int 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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