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