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 if (SOLISTENING(so)) { 211 error = EINVAL; 212 } else { 213 *(int *)data = sbavail(&so->so_rcv); 214 } 215 break; 216 217 case FIONWRITE: 218 /* Unlocked read. */ 219 if (SOLISTENING(so)) { 220 error = EINVAL; 221 } else { 222 *(int *)data = sbavail(&so->so_snd); 223 } 224 break; 225 226 case FIONSPACE: 227 /* Unlocked read. */ 228 if (SOLISTENING(so)) { 229 error = EINVAL; 230 } else { 231 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 232 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) { 233 *(int *)data = 0; 234 } else { 235 *(int *)data = sbspace(&so->so_snd); 236 } 237 } 238 break; 239 240 case FIOSETOWN: 241 error = fsetown(*(int *)data, &so->so_sigio); 242 break; 243 244 case FIOGETOWN: 245 *(int *)data = fgetown(&so->so_sigio); 246 break; 247 248 case SIOCSPGRP: 249 error = fsetown(-(*(int *)data), &so->so_sigio); 250 break; 251 252 case SIOCGPGRP: 253 *(int *)data = -fgetown(&so->so_sigio); 254 break; 255 256 case SIOCATMARK: 257 /* Unlocked read. */ 258 if (SOLISTENING(so)) { 259 error = EINVAL; 260 } else { 261 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 262 } 263 break; 264 default: 265 /* 266 * Interface/routing/protocol specific ioctls: interface and 267 * routing ioctls should have a different entry since a 268 * socket is unnecessary. 269 */ 270 if (IOCGROUP(cmd) == 'i') 271 error = ifioctl(so, cmd, data, td); 272 else if (IOCGROUP(cmd) == 'r') { 273 CURVNET_SET(so->so_vnet); 274 error = rtioctl_fib(cmd, data, so->so_fibnum); 275 CURVNET_RESTORE(); 276 } else { 277 CURVNET_SET(so->so_vnet); 278 error = ((*so->so_proto->pr_usrreqs->pru_control) 279 (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 struct thread *td) 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 if (soaio_target_procs > 0) 587 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 588 } 589 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 590 591 static __inline int 592 soaio_ready(struct socket *so, struct sockbuf *sb) 593 { 594 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 595 } 596 597 static void 598 soaio_process_job(struct socket *so, struct sockbuf *sb, struct kaiocb *job) 599 { 600 struct ucred *td_savedcred; 601 struct thread *td; 602 struct file *fp; 603 size_t cnt, done, job_total_nbytes; 604 long ru_before; 605 int error, flags; 606 607 SOCKBUF_UNLOCK(sb); 608 aio_switch_vmspace(job); 609 td = curthread; 610 fp = job->fd_file; 611 retry: 612 td_savedcred = td->td_ucred; 613 td->td_ucred = job->cred; 614 615 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 616 done = job->aio_done; 617 cnt = job->uiop->uio_resid; 618 job->uiop->uio_offset = 0; 619 job->uiop->uio_td = td; 620 flags = MSG_NBIO; 621 622 /* 623 * For resource usage accounting, only count a completed request 624 * as a single message to avoid counting multiple calls to 625 * sosend/soreceive on a blocking socket. 626 */ 627 628 if (sb == &so->so_rcv) { 629 ru_before = td->td_ru.ru_msgrcv; 630 #ifdef MAC 631 error = mac_socket_check_receive(fp->f_cred, so); 632 if (error == 0) 633 634 #endif 635 error = soreceive(so, NULL, job->uiop, NULL, NULL, 636 &flags); 637 if (td->td_ru.ru_msgrcv != ru_before) 638 job->msgrcv = 1; 639 } else { 640 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 641 flags |= MSG_MORETOCOME; 642 ru_before = td->td_ru.ru_msgsnd; 643 #ifdef MAC 644 error = mac_socket_check_send(fp->f_cred, so); 645 if (error == 0) 646 #endif 647 error = sosend(so, NULL, job->uiop, NULL, NULL, flags, 648 td); 649 if (td->td_ru.ru_msgsnd != ru_before) 650 job->msgsnd = 1; 651 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 652 PROC_LOCK(job->userproc); 653 kern_psignal(job->userproc, SIGPIPE); 654 PROC_UNLOCK(job->userproc); 655 } 656 } 657 658 done += cnt - job->uiop->uio_resid; 659 job->aio_done = done; 660 td->td_ucred = td_savedcred; 661 662 if (error == EWOULDBLOCK) { 663 /* 664 * The request was either partially completed or not 665 * completed at all due to racing with a read() or 666 * write() on the socket. If the socket is 667 * non-blocking, return with any partial completion. 668 * If the socket is blocking or if no progress has 669 * been made, requeue this request at the head of the 670 * queue to try again when the socket is ready. 671 */ 672 MPASS(done != job_total_nbytes); 673 SOCKBUF_LOCK(sb); 674 if (done == 0 || !(so->so_state & SS_NBIO)) { 675 empty_results++; 676 if (soaio_ready(so, sb)) { 677 empty_retries++; 678 SOCKBUF_UNLOCK(sb); 679 goto retry; 680 } 681 682 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 683 SOCKBUF_UNLOCK(sb); 684 if (done != 0) 685 aio_complete(job, done, 0); 686 else 687 aio_cancel(job); 688 SOCKBUF_LOCK(sb); 689 } else { 690 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 691 } 692 return; 693 } 694 SOCKBUF_UNLOCK(sb); 695 } 696 if (done != 0 && (error == ERESTART || error == EINTR || 697 error == EWOULDBLOCK)) 698 error = 0; 699 if (error) 700 aio_complete(job, -1, error); 701 else 702 aio_complete(job, done, 0); 703 SOCKBUF_LOCK(sb); 704 } 705 706 static void 707 soaio_process_sb(struct socket *so, struct sockbuf *sb) 708 { 709 struct kaiocb *job; 710 711 CURVNET_SET(so->so_vnet); 712 SOCKBUF_LOCK(sb); 713 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 714 job = TAILQ_FIRST(&sb->sb_aiojobq); 715 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 716 if (!aio_clear_cancel_function(job)) 717 continue; 718 719 soaio_process_job(so, sb, job); 720 } 721 722 /* 723 * If there are still pending requests, the socket must not be 724 * ready so set SB_AIO to request a wakeup when the socket 725 * becomes ready. 726 */ 727 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 728 sb->sb_flags |= SB_AIO; 729 sb->sb_flags &= ~SB_AIO_RUNNING; 730 SOCKBUF_UNLOCK(sb); 731 732 SOCK_LOCK(so); 733 sorele(so); 734 CURVNET_RESTORE(); 735 } 736 737 void 738 soaio_rcv(void *context, int pending) 739 { 740 struct socket *so; 741 742 so = context; 743 soaio_process_sb(so, &so->so_rcv); 744 } 745 746 void 747 soaio_snd(void *context, int pending) 748 { 749 struct socket *so; 750 751 so = context; 752 soaio_process_sb(so, &so->so_snd); 753 } 754 755 void 756 sowakeup_aio(struct socket *so, struct sockbuf *sb) 757 { 758 759 SOCKBUF_LOCK_ASSERT(sb); 760 sb->sb_flags &= ~SB_AIO; 761 if (sb->sb_flags & SB_AIO_RUNNING) 762 return; 763 sb->sb_flags |= SB_AIO_RUNNING; 764 soref(so); 765 soaio_enqueue(&sb->sb_aiotask); 766 } 767 768 static void 769 soo_aio_cancel(struct kaiocb *job) 770 { 771 struct socket *so; 772 struct sockbuf *sb; 773 long done; 774 int opcode; 775 776 so = job->fd_file->f_data; 777 opcode = job->uaiocb.aio_lio_opcode; 778 if (opcode & LIO_READ) 779 sb = &so->so_rcv; 780 else { 781 MPASS(opcode & LIO_WRITE); 782 sb = &so->so_snd; 783 } 784 785 SOCKBUF_LOCK(sb); 786 if (!aio_cancel_cleared(job)) 787 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 788 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 789 sb->sb_flags &= ~SB_AIO; 790 SOCKBUF_UNLOCK(sb); 791 792 done = job->aio_done; 793 if (done != 0) 794 aio_complete(job, done, 0); 795 else 796 aio_cancel(job); 797 } 798 799 static int 800 soo_aio_queue(struct file *fp, struct kaiocb *job) 801 { 802 struct socket *so; 803 struct sockbuf *sb; 804 int error; 805 806 so = fp->f_data; 807 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 808 if (error == 0) 809 return (0); 810 811 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 812 case LIO_READ: 813 sb = &so->so_rcv; 814 break; 815 case LIO_WRITE: 816 sb = &so->so_snd; 817 break; 818 default: 819 return (EINVAL); 820 } 821 822 SOCKBUF_LOCK(sb); 823 if (!aio_set_cancel_function(job, soo_aio_cancel)) 824 panic("new job was cancelled"); 825 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 826 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 827 if (soaio_ready(so, sb)) 828 sowakeup_aio(so, sb); 829 else 830 sb->sb_flags |= SB_AIO; 831 } 832 SOCKBUF_UNLOCK(sb); 833 return (0); 834 } 835