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 = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 149 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 150 PROC_LOCK(uio->uio_td->td_proc); 151 tdsignal(uio->uio_td, SIGPIPE); 152 PROC_UNLOCK(uio->uio_td->td_proc); 153 } 154 return (error); 155 } 156 157 static int 158 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 159 struct thread *td) 160 { 161 struct socket *so = fp->f_data; 162 int error = 0; 163 164 switch (cmd) { 165 case FIONBIO: 166 SOCK_LOCK(so); 167 if (*(int *)data) 168 so->so_state |= SS_NBIO; 169 else 170 so->so_state &= ~SS_NBIO; 171 SOCK_UNLOCK(so); 172 break; 173 174 case FIOASYNC: 175 if (*(int *)data) { 176 SOCK_LOCK(so); 177 so->so_state |= SS_ASYNC; 178 if (SOLISTENING(so)) { 179 so->sol_sbrcv_flags |= SB_ASYNC; 180 so->sol_sbsnd_flags |= SB_ASYNC; 181 } else { 182 SOCK_RECVBUF_LOCK(so); 183 so->so_rcv.sb_flags |= SB_ASYNC; 184 SOCK_RECVBUF_UNLOCK(so); 185 SOCK_SENDBUF_LOCK(so); 186 so->so_snd.sb_flags |= SB_ASYNC; 187 SOCK_SENDBUF_UNLOCK(so); 188 } 189 SOCK_UNLOCK(so); 190 } else { 191 SOCK_LOCK(so); 192 so->so_state &= ~SS_ASYNC; 193 if (SOLISTENING(so)) { 194 so->sol_sbrcv_flags &= ~SB_ASYNC; 195 so->sol_sbsnd_flags &= ~SB_ASYNC; 196 } else { 197 SOCK_RECVBUF_LOCK(so); 198 so->so_rcv.sb_flags &= ~SB_ASYNC; 199 SOCK_RECVBUF_UNLOCK(so); 200 SOCK_SENDBUF_LOCK(so); 201 so->so_snd.sb_flags &= ~SB_ASYNC; 202 SOCK_SENDBUF_UNLOCK(so); 203 } 204 SOCK_UNLOCK(so); 205 } 206 break; 207 208 case FIONREAD: 209 SOCK_RECVBUF_LOCK(so); 210 if (SOLISTENING(so)) { 211 error = EINVAL; 212 } else { 213 *(int *)data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl; 214 } 215 SOCK_RECVBUF_UNLOCK(so); 216 break; 217 218 case FIONWRITE: 219 /* Unlocked read. */ 220 if (SOLISTENING(so)) { 221 error = EINVAL; 222 } else { 223 *(int *)data = sbavail(&so->so_snd); 224 } 225 break; 226 227 case FIONSPACE: 228 /* Unlocked read. */ 229 if (SOLISTENING(so)) { 230 error = EINVAL; 231 } else { 232 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 233 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) { 234 *(int *)data = 0; 235 } else { 236 *(int *)data = sbspace(&so->so_snd); 237 } 238 } 239 break; 240 241 case FIOSETOWN: 242 error = fsetown(*(int *)data, &so->so_sigio); 243 break; 244 245 case FIOGETOWN: 246 *(int *)data = fgetown(&so->so_sigio); 247 break; 248 249 case SIOCSPGRP: 250 error = fsetown(-(*(int *)data), &so->so_sigio); 251 break; 252 253 case SIOCGPGRP: 254 *(int *)data = -fgetown(&so->so_sigio); 255 break; 256 257 case SIOCATMARK: 258 /* Unlocked read. */ 259 if (SOLISTENING(so)) { 260 error = EINVAL; 261 } else { 262 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 263 } 264 break; 265 default: 266 /* 267 * Interface/routing/protocol specific ioctls: interface and 268 * routing ioctls should have a different entry since a 269 * socket is unnecessary. 270 */ 271 if (IOCGROUP(cmd) == 'i') 272 error = ifioctl(so, cmd, data, td); 273 else if (IOCGROUP(cmd) == 'r') { 274 CURVNET_SET(so->so_vnet); 275 error = rtioctl_fib(cmd, data, so->so_fibnum); 276 CURVNET_RESTORE(); 277 } else { 278 CURVNET_SET(so->so_vnet); 279 error = so->so_proto->pr_control(so, cmd, data, 0, td); 280 CURVNET_RESTORE(); 281 } 282 break; 283 } 284 return (error); 285 } 286 287 static int 288 soo_poll(struct file *fp, int events, struct ucred *active_cred, 289 struct thread *td) 290 { 291 struct socket *so = fp->f_data; 292 #ifdef MAC 293 int error; 294 295 error = mac_socket_check_poll(active_cred, so); 296 if (error) 297 return (error); 298 #endif 299 return (sopoll(so, events, fp->f_cred, td)); 300 } 301 302 static int 303 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred) 304 { 305 struct socket *so = fp->f_data; 306 int error; 307 308 bzero((caddr_t)ub, sizeof (*ub)); 309 ub->st_mode = S_IFSOCK; 310 #ifdef MAC 311 error = mac_socket_check_stat(active_cred, so); 312 if (error) 313 return (error); 314 #endif 315 SOCK_LOCK(so); 316 if (!SOLISTENING(so)) { 317 struct sockbuf *sb; 318 319 /* 320 * If SBS_CANTRCVMORE is set, but there's still data left 321 * in the receive buffer, the socket is still readable. 322 */ 323 sb = &so->so_rcv; 324 SOCK_RECVBUF_LOCK(so); 325 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 326 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 327 ub->st_size = sbavail(sb) - sb->sb_ctl; 328 SOCK_RECVBUF_UNLOCK(so); 329 330 sb = &so->so_snd; 331 SOCK_SENDBUF_LOCK(so); 332 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 333 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 334 SOCK_SENDBUF_UNLOCK(so); 335 } 336 ub->st_uid = so->so_cred->cr_uid; 337 ub->st_gid = so->so_cred->cr_gid; 338 error = so->so_proto->pr_sense(so, ub); 339 SOCK_UNLOCK(so); 340 return (error); 341 } 342 343 /* 344 * API socket close on file pointer. We call soclose() to close the socket 345 * (including initiating closing protocols). soclose() will sorele() the 346 * file reference but the actual socket will not go away until the socket's 347 * ref count hits 0. 348 */ 349 static int 350 soo_close(struct file *fp, struct thread *td) 351 { 352 int error = 0; 353 struct socket *so; 354 355 so = fp->f_data; 356 fp->f_ops = &badfileops; 357 fp->f_data = NULL; 358 359 if (so) 360 error = soclose(so); 361 return (error); 362 } 363 364 static int 365 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 366 { 367 struct sockaddr *sa; 368 struct inpcb *inpcb; 369 struct unpcb *unpcb; 370 struct socket *so; 371 int error; 372 373 kif->kf_type = KF_TYPE_SOCKET; 374 so = fp->f_data; 375 CURVNET_SET(so->so_vnet); 376 kif->kf_un.kf_sock.kf_sock_domain0 = 377 so->so_proto->pr_domain->dom_family; 378 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 379 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 380 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 381 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 382 case AF_INET: 383 case AF_INET6: 384 if (so->so_pcb != NULL) { 385 inpcb = (struct inpcb *)(so->so_pcb); 386 kif->kf_un.kf_sock.kf_sock_inpcb = 387 (uintptr_t)inpcb->inp_ppcb; 388 } 389 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 390 so->so_rcv.sb_state; 391 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 392 so->so_snd.sb_state; 393 kif->kf_un.kf_sock.kf_sock_sendq = 394 sbused(&so->so_snd); 395 kif->kf_un.kf_sock.kf_sock_recvq = 396 sbused(&so->so_rcv); 397 break; 398 case AF_UNIX: 399 if (so->so_pcb != NULL) { 400 unpcb = (struct unpcb *)(so->so_pcb); 401 if (unpcb->unp_conn) { 402 kif->kf_un.kf_sock.kf_sock_unpconn = 403 (uintptr_t)unpcb->unp_conn; 404 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 405 so->so_rcv.sb_state; 406 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 407 so->so_snd.sb_state; 408 kif->kf_un.kf_sock.kf_sock_sendq = 409 sbused(&so->so_snd); 410 kif->kf_un.kf_sock.kf_sock_recvq = 411 sbused(&so->so_rcv); 412 } 413 } 414 break; 415 } 416 error = so->so_proto->pr_sockaddr(so, &sa); 417 if (error == 0 && 418 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 419 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 420 free(sa, M_SONAME); 421 } 422 error = so->so_proto->pr_peeraddr(so, &sa); 423 if (error == 0 && 424 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 425 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 426 free(sa, M_SONAME); 427 } 428 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 429 sizeof(kif->kf_path)); 430 CURVNET_RESTORE(); 431 return (0); 432 } 433 434 /* 435 * Use the 'backend3' field in AIO jobs to store the amount of data 436 * completed by the AIO job so far. 437 */ 438 #define aio_done backend3 439 440 static STAILQ_HEAD(, task) soaio_jobs; 441 static struct mtx soaio_jobs_lock; 442 static struct task soaio_kproc_task; 443 static int soaio_starting, soaio_idle, soaio_queued; 444 static struct unrhdr *soaio_kproc_unr; 445 446 static int soaio_max_procs = MAX_AIO_PROCS; 447 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 448 "Maximum number of kernel processes to use for async socket IO"); 449 450 static int soaio_num_procs; 451 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 452 "Number of active kernel processes for async socket IO"); 453 454 static int soaio_target_procs = TARGET_AIO_PROCS; 455 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 456 &soaio_target_procs, 0, 457 "Preferred number of ready kernel processes for async socket IO"); 458 459 static int soaio_lifetime; 460 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 461 "Maximum lifetime for idle aiod"); 462 463 static void 464 soaio_kproc_loop(void *arg) 465 { 466 struct proc *p; 467 struct vmspace *myvm; 468 struct task *task; 469 int error, id, pending; 470 471 id = (intptr_t)arg; 472 473 /* 474 * Grab an extra reference on the daemon's vmspace so that it 475 * doesn't get freed by jobs that switch to a different 476 * vmspace. 477 */ 478 p = curproc; 479 myvm = vmspace_acquire_ref(p); 480 481 mtx_lock(&soaio_jobs_lock); 482 MPASS(soaio_starting > 0); 483 soaio_starting--; 484 for (;;) { 485 while (!STAILQ_EMPTY(&soaio_jobs)) { 486 task = STAILQ_FIRST(&soaio_jobs); 487 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 488 soaio_queued--; 489 pending = task->ta_pending; 490 task->ta_pending = 0; 491 mtx_unlock(&soaio_jobs_lock); 492 493 task->ta_func(task->ta_context, pending); 494 495 mtx_lock(&soaio_jobs_lock); 496 } 497 MPASS(soaio_queued == 0); 498 499 if (p->p_vmspace != myvm) { 500 mtx_unlock(&soaio_jobs_lock); 501 vmspace_switch_aio(myvm); 502 mtx_lock(&soaio_jobs_lock); 503 continue; 504 } 505 506 soaio_idle++; 507 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 508 soaio_lifetime); 509 soaio_idle--; 510 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 511 soaio_num_procs > soaio_target_procs) 512 break; 513 } 514 soaio_num_procs--; 515 mtx_unlock(&soaio_jobs_lock); 516 free_unr(soaio_kproc_unr, id); 517 kproc_exit(0); 518 } 519 520 static void 521 soaio_kproc_create(void *context, int pending) 522 { 523 struct proc *p; 524 int error, id; 525 526 mtx_lock(&soaio_jobs_lock); 527 for (;;) { 528 if (soaio_num_procs < soaio_target_procs) { 529 /* Must create */ 530 } else if (soaio_num_procs >= soaio_max_procs) { 531 /* 532 * Hit the limit on kernel processes, don't 533 * create another one. 534 */ 535 break; 536 } else if (soaio_queued <= soaio_idle + soaio_starting) { 537 /* 538 * No more AIO jobs waiting for a process to be 539 * created, so stop. 540 */ 541 break; 542 } 543 soaio_starting++; 544 mtx_unlock(&soaio_jobs_lock); 545 546 id = alloc_unr(soaio_kproc_unr); 547 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 548 &p, 0, 0, "soaiod%d", id); 549 if (error != 0) { 550 free_unr(soaio_kproc_unr, id); 551 mtx_lock(&soaio_jobs_lock); 552 soaio_starting--; 553 break; 554 } 555 556 mtx_lock(&soaio_jobs_lock); 557 soaio_num_procs++; 558 } 559 mtx_unlock(&soaio_jobs_lock); 560 } 561 562 void 563 soaio_enqueue(struct task *task) 564 { 565 566 mtx_lock(&soaio_jobs_lock); 567 MPASS(task->ta_pending == 0); 568 task->ta_pending++; 569 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 570 soaio_queued++; 571 if (soaio_queued <= soaio_idle) 572 wakeup_one(&soaio_idle); 573 else if (soaio_num_procs < soaio_max_procs) 574 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 575 mtx_unlock(&soaio_jobs_lock); 576 } 577 578 static void 579 soaio_init(void) 580 { 581 582 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 583 STAILQ_INIT(&soaio_jobs); 584 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 585 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 586 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 587 } 588 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 589 590 static __inline int 591 soaio_ready(struct socket *so, struct sockbuf *sb) 592 { 593 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 594 } 595 596 static void 597 soaio_process_job(struct socket *so, sb_which which, struct kaiocb *job) 598 { 599 struct ucred *td_savedcred; 600 struct thread *td; 601 struct sockbuf *sb = sobuf(so, which); 602 #ifdef MAC 603 struct file *fp = job->fd_file; 604 #endif 605 size_t cnt, done, job_total_nbytes __diagused; 606 long ru_before; 607 int error, flags; 608 609 SOCK_BUF_UNLOCK(so, which); 610 aio_switch_vmspace(job); 611 td = curthread; 612 retry: 613 td_savedcred = td->td_ucred; 614 td->td_ucred = job->cred; 615 616 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 617 done = job->aio_done; 618 cnt = job->uiop->uio_resid; 619 job->uiop->uio_offset = 0; 620 job->uiop->uio_td = td; 621 flags = MSG_NBIO; 622 623 /* 624 * For resource usage accounting, only count a completed request 625 * as a single message to avoid counting multiple calls to 626 * sosend/soreceive on a blocking socket. 627 */ 628 629 if (sb == &so->so_rcv) { 630 ru_before = td->td_ru.ru_msgrcv; 631 #ifdef MAC 632 error = mac_socket_check_receive(fp->f_cred, so); 633 if (error == 0) 634 635 #endif 636 error = soreceive(so, NULL, job->uiop, NULL, NULL, 637 &flags); 638 if (td->td_ru.ru_msgrcv != ru_before) 639 job->msgrcv = 1; 640 } else { 641 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 642 flags |= MSG_MORETOCOME; 643 ru_before = td->td_ru.ru_msgsnd; 644 #ifdef MAC 645 error = mac_socket_check_send(fp->f_cred, so); 646 if (error == 0) 647 #endif 648 error = sosend(so, NULL, job->uiop, NULL, NULL, flags, 649 td); 650 if (td->td_ru.ru_msgsnd != ru_before) 651 job->msgsnd = 1; 652 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 653 PROC_LOCK(job->userproc); 654 kern_psignal(job->userproc, SIGPIPE); 655 PROC_UNLOCK(job->userproc); 656 } 657 } 658 659 done += cnt - job->uiop->uio_resid; 660 job->aio_done = done; 661 td->td_ucred = td_savedcred; 662 663 if (error == EWOULDBLOCK) { 664 /* 665 * The request was either partially completed or not 666 * completed at all due to racing with a read() or 667 * write() on the socket. If the socket is 668 * non-blocking, return with any partial completion. 669 * If the socket is blocking or if no progress has 670 * been made, requeue this request at the head of the 671 * queue to try again when the socket is ready. 672 */ 673 MPASS(done != job_total_nbytes); 674 SOCK_BUF_LOCK(so, which); 675 if (done == 0 || !(so->so_state & SS_NBIO)) { 676 empty_results++; 677 if (soaio_ready(so, sb)) { 678 empty_retries++; 679 SOCK_BUF_UNLOCK(so, which); 680 goto retry; 681 } 682 683 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 684 SOCK_BUF_UNLOCK(so, which); 685 if (done != 0) 686 aio_complete(job, done, 0); 687 else 688 aio_cancel(job); 689 SOCK_BUF_LOCK(so, which); 690 } else { 691 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 692 } 693 return; 694 } 695 SOCK_BUF_UNLOCK(so, which); 696 } 697 if (done != 0 && (error == ERESTART || error == EINTR || 698 error == EWOULDBLOCK)) 699 error = 0; 700 if (error) 701 aio_complete(job, -1, error); 702 else 703 aio_complete(job, done, 0); 704 SOCK_BUF_LOCK(so, which); 705 } 706 707 static void 708 soaio_process_sb(struct socket *so, sb_which which) 709 { 710 struct kaiocb *job; 711 struct sockbuf *sb = sobuf(so, which); 712 713 CURVNET_SET(so->so_vnet); 714 SOCK_BUF_LOCK(so, which); 715 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 716 job = TAILQ_FIRST(&sb->sb_aiojobq); 717 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 718 if (!aio_clear_cancel_function(job)) 719 continue; 720 721 soaio_process_job(so, which, job); 722 } 723 724 /* 725 * If there are still pending requests, the socket must not be 726 * ready so set SB_AIO to request a wakeup when the socket 727 * becomes ready. 728 */ 729 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 730 sb->sb_flags |= SB_AIO; 731 sb->sb_flags &= ~SB_AIO_RUNNING; 732 SOCK_BUF_UNLOCK(so, which); 733 734 sorele(so); 735 CURVNET_RESTORE(); 736 } 737 738 void 739 soaio_rcv(void *context, int pending) 740 { 741 struct socket *so; 742 743 so = context; 744 soaio_process_sb(so, SO_RCV); 745 } 746 747 void 748 soaio_snd(void *context, int pending) 749 { 750 struct socket *so; 751 752 so = context; 753 soaio_process_sb(so, SO_SND); 754 } 755 756 void 757 sowakeup_aio(struct socket *so, sb_which which) 758 { 759 struct sockbuf *sb = sobuf(so, which); 760 761 SOCK_BUF_LOCK_ASSERT(so, which); 762 763 sb->sb_flags &= ~SB_AIO; 764 if (sb->sb_flags & SB_AIO_RUNNING) 765 return; 766 sb->sb_flags |= SB_AIO_RUNNING; 767 soref(so); 768 soaio_enqueue(&sb->sb_aiotask); 769 } 770 771 static void 772 soo_aio_cancel(struct kaiocb *job) 773 { 774 struct socket *so; 775 struct sockbuf *sb; 776 long done; 777 int opcode; 778 sb_which which; 779 780 so = job->fd_file->f_data; 781 opcode = job->uaiocb.aio_lio_opcode; 782 if (opcode & LIO_READ) { 783 sb = &so->so_rcv; 784 which = SO_RCV; 785 } else { 786 MPASS(opcode & LIO_WRITE); 787 sb = &so->so_snd; 788 which = SO_SND; 789 } 790 791 SOCK_BUF_LOCK(so, which); 792 if (!aio_cancel_cleared(job)) 793 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 794 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 795 sb->sb_flags &= ~SB_AIO; 796 SOCK_BUF_UNLOCK(so, which); 797 798 done = job->aio_done; 799 if (done != 0) 800 aio_complete(job, done, 0); 801 else 802 aio_cancel(job); 803 } 804 805 static int 806 soo_aio_queue(struct file *fp, struct kaiocb *job) 807 { 808 struct socket *so; 809 struct sockbuf *sb; 810 sb_which which; 811 int error; 812 813 so = fp->f_data; 814 error = so->so_proto->pr_aio_queue(so, job); 815 if (error == 0) 816 return (0); 817 818 /* Lock through the socket, since this may be a listening socket. */ 819 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 820 case LIO_READ: 821 SOCK_RECVBUF_LOCK(so); 822 sb = &so->so_rcv; 823 which = SO_RCV; 824 break; 825 case LIO_WRITE: 826 SOCK_SENDBUF_LOCK(so); 827 sb = &so->so_snd; 828 which = SO_SND; 829 break; 830 default: 831 return (EINVAL); 832 } 833 834 if (SOLISTENING(so)) { 835 SOCK_BUF_UNLOCK(so, which); 836 return (EINVAL); 837 } 838 839 if (!aio_set_cancel_function(job, soo_aio_cancel)) 840 panic("new job was cancelled"); 841 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 842 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 843 if (soaio_ready(so, sb)) 844 sowakeup_aio(so, which); 845 else 846 sb->sb_flags |= SB_AIO; 847 } 848 SOCK_BUF_UNLOCK(so, which); 849 return (0); 850 } 851