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 #ifndef FSTACK 99 static fo_fill_kinfo_t soo_fill_kinfo; 100 static fo_aio_queue_t soo_aio_queue; 101 102 static void soo_aio_cancel(struct kaiocb *job); 103 #endif 104 105 struct fileops socketops = { 106 .fo_read = soo_read, 107 .fo_write = soo_write, 108 .fo_truncate = invfo_truncate, 109 .fo_ioctl = soo_ioctl, 110 .fo_poll = soo_poll, 111 .fo_kqfilter = soo_kqfilter, 112 .fo_stat = soo_stat, 113 .fo_close = soo_close, 114 .fo_chmod = invfo_chmod, 115 .fo_chown = invfo_chown, 116 .fo_sendfile = invfo_sendfile, 117 #ifndef FSTACK 118 .fo_fill_kinfo = soo_fill_kinfo, 119 .fo_aio_queue = soo_aio_queue, 120 #endif 121 .fo_flags = DFLAG_PASSABLE 122 }; 123 124 static int 125 soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 126 int flags, struct thread *td) 127 { 128 struct socket *so = fp->f_data; 129 int error; 130 131 #ifdef MAC 132 error = mac_socket_check_receive(active_cred, so); 133 if (error) 134 return (error); 135 #endif 136 error = soreceive(so, 0, uio, 0, 0, 0); 137 return (error); 138 } 139 140 static int 141 soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 142 int flags, struct thread *td) 143 { 144 struct socket *so = fp->f_data; 145 int error; 146 147 #ifdef MAC 148 error = mac_socket_check_send(active_cred, so); 149 if (error) 150 return (error); 151 #endif 152 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 153 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 154 PROC_LOCK(uio->uio_td->td_proc); 155 tdsignal(uio->uio_td, SIGPIPE); 156 PROC_UNLOCK(uio->uio_td->td_proc); 157 } 158 return (error); 159 } 160 161 static int 162 soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 163 struct thread *td) 164 { 165 struct socket *so = fp->f_data; 166 int error = 0; 167 168 switch (cmd) { 169 case FIONBIO: 170 SOCK_LOCK(so); 171 if (*(int *)data) 172 so->so_state |= SS_NBIO; 173 else 174 so->so_state &= ~SS_NBIO; 175 SOCK_UNLOCK(so); 176 break; 177 178 case FIOASYNC: 179 if (*(int *)data) { 180 SOCK_LOCK(so); 181 so->so_state |= SS_ASYNC; 182 if (SOLISTENING(so)) { 183 so->sol_sbrcv_flags |= SB_ASYNC; 184 so->sol_sbsnd_flags |= SB_ASYNC; 185 } else { 186 SOCKBUF_LOCK(&so->so_rcv); 187 so->so_rcv.sb_flags |= SB_ASYNC; 188 SOCKBUF_UNLOCK(&so->so_rcv); 189 SOCKBUF_LOCK(&so->so_snd); 190 so->so_snd.sb_flags |= SB_ASYNC; 191 SOCKBUF_UNLOCK(&so->so_snd); 192 } 193 SOCK_UNLOCK(so); 194 } else { 195 SOCK_LOCK(so); 196 so->so_state &= ~SS_ASYNC; 197 if (SOLISTENING(so)) { 198 so->sol_sbrcv_flags &= ~SB_ASYNC; 199 so->sol_sbsnd_flags &= ~SB_ASYNC; 200 } else { 201 SOCKBUF_LOCK(&so->so_rcv); 202 so->so_rcv.sb_flags &= ~SB_ASYNC; 203 SOCKBUF_UNLOCK(&so->so_rcv); 204 SOCKBUF_LOCK(&so->so_snd); 205 so->so_snd.sb_flags &= ~SB_ASYNC; 206 SOCKBUF_UNLOCK(&so->so_snd); 207 } 208 SOCK_UNLOCK(so); 209 } 210 break; 211 212 case FIONREAD: 213 /* Unlocked read. */ 214 if (SOLISTENING(so)) { 215 error = EINVAL; 216 } else { 217 *(int *)data = sbavail(&so->so_rcv); 218 } 219 break; 220 221 case FIONWRITE: 222 /* Unlocked read. */ 223 if (SOLISTENING(so)) { 224 error = EINVAL; 225 } else { 226 *(int *)data = sbavail(&so->so_snd); 227 } 228 break; 229 230 case FIONSPACE: 231 /* Unlocked read. */ 232 if (SOLISTENING(so)) { 233 error = EINVAL; 234 } else { 235 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 236 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) { 237 *(int *)data = 0; 238 } else { 239 *(int *)data = sbspace(&so->so_snd); 240 } 241 } 242 break; 243 244 case FIOSETOWN: 245 error = fsetown(*(int *)data, &so->so_sigio); 246 break; 247 248 case FIOGETOWN: 249 *(int *)data = fgetown(&so->so_sigio); 250 break; 251 252 case SIOCSPGRP: 253 error = fsetown(-(*(int *)data), &so->so_sigio); 254 break; 255 256 case SIOCGPGRP: 257 *(int *)data = -fgetown(&so->so_sigio); 258 break; 259 260 case SIOCATMARK: 261 /* Unlocked read. */ 262 if (SOLISTENING(so)) { 263 error = EINVAL; 264 } else { 265 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 266 } 267 break; 268 default: 269 /* 270 * Interface/routing/protocol specific ioctls: interface and 271 * routing ioctls should have a different entry since a 272 * socket is unnecessary. 273 */ 274 if (IOCGROUP(cmd) == 'i') 275 error = ifioctl(so, cmd, data, td); 276 else if (IOCGROUP(cmd) == 'r') { 277 CURVNET_SET(so->so_vnet); 278 error = rtioctl_fib(cmd, data, so->so_fibnum); 279 CURVNET_RESTORE(); 280 } else { 281 CURVNET_SET(so->so_vnet); 282 error = ((*so->so_proto->pr_usrreqs->pru_control) 283 (so, cmd, data, 0, td)); 284 CURVNET_RESTORE(); 285 } 286 break; 287 } 288 return (error); 289 } 290 291 static int 292 soo_poll(struct file *fp, int events, struct ucred *active_cred, 293 struct thread *td) 294 { 295 struct socket *so = fp->f_data; 296 #ifdef MAC 297 int error; 298 299 error = mac_socket_check_poll(active_cred, so); 300 if (error) 301 return (error); 302 #endif 303 return (sopoll(so, events, fp->f_cred, td)); 304 } 305 306 static int 307 soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 308 struct thread *td) 309 { 310 struct socket *so = fp->f_data; 311 int error; 312 313 bzero((caddr_t)ub, sizeof (*ub)); 314 ub->st_mode = S_IFSOCK; 315 #ifdef MAC 316 error = mac_socket_check_stat(active_cred, so); 317 if (error) 318 return (error); 319 #endif 320 SOCK_LOCK(so); 321 if (!SOLISTENING(so)) { 322 struct sockbuf *sb; 323 324 /* 325 * If SBS_CANTRCVMORE is set, but there's still data left 326 * in the receive buffer, the socket is still readable. 327 */ 328 sb = &so->so_rcv; 329 SOCKBUF_LOCK(sb); 330 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 331 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 332 ub->st_size = sbavail(sb) - sb->sb_ctl; 333 SOCKBUF_UNLOCK(sb); 334 335 sb = &so->so_snd; 336 SOCKBUF_LOCK(sb); 337 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 338 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 339 SOCKBUF_UNLOCK(sb); 340 } 341 ub->st_uid = so->so_cred->cr_uid; 342 ub->st_gid = so->so_cred->cr_gid; 343 error = so->so_proto->pr_usrreqs->pru_sense(so, ub); 344 SOCK_UNLOCK(so); 345 return (error); 346 } 347 348 /* 349 * API socket close on file pointer. We call soclose() to close the socket 350 * (including initiating closing protocols). soclose() will sorele() the 351 * file reference but the actual socket will not go away until the socket's 352 * ref count hits 0. 353 */ 354 static int 355 soo_close(struct file *fp, struct thread *td) 356 { 357 int error = 0; 358 struct socket *so; 359 360 so = fp->f_data; 361 fp->f_ops = &badfileops; 362 fp->f_data = NULL; 363 364 if (so) 365 error = soclose(so); 366 return (error); 367 } 368 369 #ifndef FSTACK 370 static int 371 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 372 { 373 struct sockaddr *sa; 374 struct inpcb *inpcb; 375 struct unpcb *unpcb; 376 struct socket *so; 377 int error; 378 379 kif->kf_type = KF_TYPE_SOCKET; 380 so = fp->f_data; 381 CURVNET_SET(so->so_vnet); 382 kif->kf_un.kf_sock.kf_sock_domain0 = 383 so->so_proto->pr_domain->dom_family; 384 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 385 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 386 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 387 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 388 case AF_INET: 389 case AF_INET6: 390 if (kif->kf_un.kf_sock.kf_sock_protocol0 == IPPROTO_TCP) { 391 if (so->so_pcb != NULL) { 392 inpcb = (struct inpcb *)(so->so_pcb); 393 kif->kf_un.kf_sock.kf_sock_inpcb = 394 (uintptr_t)inpcb->inp_ppcb; 395 kif->kf_un.kf_sock.kf_sock_sendq = 396 sbused(&so->so_snd); 397 kif->kf_un.kf_sock.kf_sock_recvq = 398 sbused(&so->so_rcv); 399 } 400 } 401 break; 402 case AF_UNIX: 403 if (so->so_pcb != NULL) { 404 unpcb = (struct unpcb *)(so->so_pcb); 405 if (unpcb->unp_conn) { 406 kif->kf_un.kf_sock.kf_sock_unpconn = 407 (uintptr_t)unpcb->unp_conn; 408 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 409 so->so_rcv.sb_state; 410 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 411 so->so_snd.sb_state; 412 kif->kf_un.kf_sock.kf_sock_sendq = 413 sbused(&so->so_snd); 414 kif->kf_un.kf_sock.kf_sock_recvq = 415 sbused(&so->so_rcv); 416 } 417 } 418 break; 419 } 420 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 421 if (error == 0 && 422 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 423 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 424 free(sa, M_SONAME); 425 } 426 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 427 if (error == 0 && 428 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 429 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 430 free(sa, M_SONAME); 431 } 432 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 433 sizeof(kif->kf_path)); 434 CURVNET_RESTORE(); 435 return (0); 436 } 437 438 /* 439 * Use the 'backend3' field in AIO jobs to store the amount of data 440 * completed by the AIO job so far. 441 */ 442 #define aio_done backend3 443 444 static STAILQ_HEAD(, task) soaio_jobs; 445 static struct mtx soaio_jobs_lock; 446 static struct task soaio_kproc_task; 447 static int soaio_starting, soaio_idle, soaio_queued; 448 static struct unrhdr *soaio_kproc_unr; 449 450 static int soaio_max_procs = MAX_AIO_PROCS; 451 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 452 "Maximum number of kernel processes to use for async socket IO"); 453 454 static int soaio_num_procs; 455 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 456 "Number of active kernel processes for async socket IO"); 457 458 static int soaio_target_procs = TARGET_AIO_PROCS; 459 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 460 &soaio_target_procs, 0, 461 "Preferred number of ready kernel processes for async socket IO"); 462 463 static int soaio_lifetime; 464 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 465 "Maximum lifetime for idle aiod"); 466 467 static void 468 soaio_kproc_loop(void *arg) 469 { 470 struct proc *p; 471 struct vmspace *myvm; 472 struct task *task; 473 int error, id, pending; 474 475 id = (intptr_t)arg; 476 477 /* 478 * Grab an extra reference on the daemon's vmspace so that it 479 * doesn't get freed by jobs that switch to a different 480 * vmspace. 481 */ 482 p = curproc; 483 myvm = vmspace_acquire_ref(p); 484 485 mtx_lock(&soaio_jobs_lock); 486 MPASS(soaio_starting > 0); 487 soaio_starting--; 488 for (;;) { 489 while (!STAILQ_EMPTY(&soaio_jobs)) { 490 task = STAILQ_FIRST(&soaio_jobs); 491 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 492 soaio_queued--; 493 pending = task->ta_pending; 494 task->ta_pending = 0; 495 mtx_unlock(&soaio_jobs_lock); 496 497 task->ta_func(task->ta_context, pending); 498 499 mtx_lock(&soaio_jobs_lock); 500 } 501 MPASS(soaio_queued == 0); 502 503 if (p->p_vmspace != myvm) { 504 mtx_unlock(&soaio_jobs_lock); 505 vmspace_switch_aio(myvm); 506 mtx_lock(&soaio_jobs_lock); 507 continue; 508 } 509 510 soaio_idle++; 511 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 512 soaio_lifetime); 513 soaio_idle--; 514 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 515 soaio_num_procs > soaio_target_procs) 516 break; 517 } 518 soaio_num_procs--; 519 mtx_unlock(&soaio_jobs_lock); 520 free_unr(soaio_kproc_unr, id); 521 kproc_exit(0); 522 } 523 524 static void 525 soaio_kproc_create(void *context, int pending) 526 { 527 struct proc *p; 528 int error, id; 529 530 mtx_lock(&soaio_jobs_lock); 531 for (;;) { 532 if (soaio_num_procs < soaio_target_procs) { 533 /* Must create */ 534 } else if (soaio_num_procs >= soaio_max_procs) { 535 /* 536 * Hit the limit on kernel processes, don't 537 * create another one. 538 */ 539 break; 540 } else if (soaio_queued <= soaio_idle + soaio_starting) { 541 /* 542 * No more AIO jobs waiting for a process to be 543 * created, so stop. 544 */ 545 break; 546 } 547 soaio_starting++; 548 mtx_unlock(&soaio_jobs_lock); 549 550 id = alloc_unr(soaio_kproc_unr); 551 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 552 &p, 0, 0, "soaiod%d", id); 553 if (error != 0) { 554 free_unr(soaio_kproc_unr, id); 555 mtx_lock(&soaio_jobs_lock); 556 soaio_starting--; 557 break; 558 } 559 560 mtx_lock(&soaio_jobs_lock); 561 soaio_num_procs++; 562 } 563 mtx_unlock(&soaio_jobs_lock); 564 } 565 566 void 567 soaio_enqueue(struct task *task) 568 { 569 570 mtx_lock(&soaio_jobs_lock); 571 MPASS(task->ta_pending == 0); 572 task->ta_pending++; 573 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 574 soaio_queued++; 575 if (soaio_queued <= soaio_idle) 576 wakeup_one(&soaio_idle); 577 else if (soaio_num_procs < soaio_max_procs) 578 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 579 mtx_unlock(&soaio_jobs_lock); 580 } 581 582 static void 583 soaio_init(void) 584 { 585 586 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 587 STAILQ_INIT(&soaio_jobs); 588 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 589 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 590 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 591 if (soaio_target_procs > 0) 592 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 593 } 594 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 595 596 static __inline int 597 soaio_ready(struct socket *so, struct sockbuf *sb) 598 { 599 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 600 } 601 602 static void 603 soaio_process_job(struct socket *so, struct sockbuf *sb, struct kaiocb *job) 604 { 605 struct ucred *td_savedcred; 606 struct thread *td; 607 struct file *fp; 608 size_t cnt, done, job_total_nbytes; 609 long ru_before; 610 int error, flags; 611 612 SOCKBUF_UNLOCK(sb); 613 aio_switch_vmspace(job); 614 td = curthread; 615 fp = job->fd_file; 616 retry: 617 td_savedcred = td->td_ucred; 618 td->td_ucred = job->cred; 619 620 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 621 done = job->aio_done; 622 cnt = job->uiop->uio_resid; 623 job->uiop->uio_offset = 0; 624 job->uiop->uio_td = td; 625 flags = MSG_NBIO; 626 627 /* 628 * For resource usage accounting, only count a completed request 629 * as a single message to avoid counting multiple calls to 630 * sosend/soreceive on a blocking socket. 631 */ 632 633 if (sb == &so->so_rcv) { 634 ru_before = td->td_ru.ru_msgrcv; 635 #ifdef MAC 636 error = mac_socket_check_receive(fp->f_cred, so); 637 if (error == 0) 638 639 #endif 640 error = soreceive(so, NULL, job->uiop, NULL, NULL, 641 &flags); 642 if (td->td_ru.ru_msgrcv != ru_before) 643 job->msgrcv = 1; 644 } else { 645 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 646 flags |= MSG_MORETOCOME; 647 ru_before = td->td_ru.ru_msgsnd; 648 #ifdef MAC 649 error = mac_socket_check_send(fp->f_cred, so); 650 if (error == 0) 651 #endif 652 error = sosend(so, NULL, job->uiop, NULL, NULL, flags, 653 td); 654 if (td->td_ru.ru_msgsnd != ru_before) 655 job->msgsnd = 1; 656 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 657 PROC_LOCK(job->userproc); 658 kern_psignal(job->userproc, SIGPIPE); 659 PROC_UNLOCK(job->userproc); 660 } 661 } 662 663 done += cnt - job->uiop->uio_resid; 664 job->aio_done = done; 665 td->td_ucred = td_savedcred; 666 667 if (error == EWOULDBLOCK) { 668 /* 669 * The request was either partially completed or not 670 * completed at all due to racing with a read() or 671 * write() on the socket. If the socket is 672 * non-blocking, return with any partial completion. 673 * If the socket is blocking or if no progress has 674 * been made, requeue this request at the head of the 675 * queue to try again when the socket is ready. 676 */ 677 MPASS(done != job_total_nbytes); 678 SOCKBUF_LOCK(sb); 679 if (done == 0 || !(so->so_state & SS_NBIO)) { 680 empty_results++; 681 if (soaio_ready(so, sb)) { 682 empty_retries++; 683 SOCKBUF_UNLOCK(sb); 684 goto retry; 685 } 686 687 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 688 SOCKBUF_UNLOCK(sb); 689 if (done != 0) 690 aio_complete(job, done, 0); 691 else 692 aio_cancel(job); 693 SOCKBUF_LOCK(sb); 694 } else { 695 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 696 } 697 return; 698 } 699 SOCKBUF_UNLOCK(sb); 700 } 701 if (done != 0 && (error == ERESTART || error == EINTR || 702 error == EWOULDBLOCK)) 703 error = 0; 704 if (error) 705 aio_complete(job, -1, error); 706 else 707 aio_complete(job, done, 0); 708 SOCKBUF_LOCK(sb); 709 } 710 711 static void 712 soaio_process_sb(struct socket *so, struct sockbuf *sb) 713 { 714 struct kaiocb *job; 715 716 CURVNET_SET(so->so_vnet); 717 SOCKBUF_LOCK(sb); 718 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 719 job = TAILQ_FIRST(&sb->sb_aiojobq); 720 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 721 if (!aio_clear_cancel_function(job)) 722 continue; 723 724 soaio_process_job(so, sb, job); 725 } 726 727 /* 728 * If there are still pending requests, the socket must not be 729 * ready so set SB_AIO to request a wakeup when the socket 730 * becomes ready. 731 */ 732 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 733 sb->sb_flags |= SB_AIO; 734 sb->sb_flags &= ~SB_AIO_RUNNING; 735 SOCKBUF_UNLOCK(sb); 736 737 SOCK_LOCK(so); 738 sorele(so); 739 CURVNET_RESTORE(); 740 } 741 742 void 743 soaio_rcv(void *context, int pending) 744 { 745 struct socket *so; 746 747 so = context; 748 soaio_process_sb(so, &so->so_rcv); 749 } 750 751 void 752 soaio_snd(void *context, int pending) 753 { 754 struct socket *so; 755 756 so = context; 757 soaio_process_sb(so, &so->so_snd); 758 } 759 760 void 761 sowakeup_aio(struct socket *so, struct sockbuf *sb) 762 { 763 764 SOCKBUF_LOCK_ASSERT(sb); 765 sb->sb_flags &= ~SB_AIO; 766 if (sb->sb_flags & SB_AIO_RUNNING) 767 return; 768 sb->sb_flags |= SB_AIO_RUNNING; 769 soref(so); 770 soaio_enqueue(&sb->sb_aiotask); 771 } 772 773 static void 774 soo_aio_cancel(struct kaiocb *job) 775 { 776 struct socket *so; 777 struct sockbuf *sb; 778 long done; 779 int opcode; 780 781 so = job->fd_file->f_data; 782 opcode = job->uaiocb.aio_lio_opcode; 783 if (opcode & LIO_READ) 784 sb = &so->so_rcv; 785 else { 786 MPASS(opcode & LIO_WRITE); 787 sb = &so->so_snd; 788 } 789 790 SOCKBUF_LOCK(sb); 791 if (!aio_cancel_cleared(job)) 792 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 793 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 794 sb->sb_flags &= ~SB_AIO; 795 SOCKBUF_UNLOCK(sb); 796 797 done = job->aio_done; 798 if (done != 0) 799 aio_complete(job, done, 0); 800 else 801 aio_cancel(job); 802 } 803 804 static int 805 soo_aio_queue(struct file *fp, struct kaiocb *job) 806 { 807 struct socket *so; 808 struct sockbuf *sb; 809 int error; 810 811 so = fp->f_data; 812 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 813 if (error == 0) 814 return (0); 815 816 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 817 case LIO_READ: 818 sb = &so->so_rcv; 819 break; 820 case LIO_WRITE: 821 sb = &so->so_snd; 822 break; 823 default: 824 return (EINVAL); 825 } 826 827 SOCKBUF_LOCK(sb); 828 if (!aio_set_cancel_function(job, soo_aio_cancel)) 829 panic("new job was cancelled"); 830 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 831 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 832 if (soaio_ready(so, sb)) 833 sowakeup_aio(so, sb); 834 else 835 sb->sb_flags |= SB_AIO; 836 } 837 SOCKBUF_UNLOCK(sb); 838 return (0); 839 } 840 #endif 841