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