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_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 SOCK_RECVBUF_LOCK(so); 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 SOCK_RECVBUF_UNLOCK(so); 330 331 sb = &so->so_snd; 332 SOCK_SENDBUF_LOCK(so); 333 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 334 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 335 SOCK_SENDBUF_UNLOCK(so); 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 (so->so_pcb != NULL) { 386 inpcb = (struct inpcb *)(so->so_pcb); 387 kif->kf_un.kf_sock.kf_sock_inpcb = 388 (uintptr_t)inpcb->inp_ppcb; 389 } 390 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 391 so->so_rcv.sb_state; 392 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 393 so->so_snd.sb_state; 394 kif->kf_un.kf_sock.kf_sock_sendq = 395 sbused(&so->so_snd); 396 kif->kf_un.kf_sock.kf_sock_recvq = 397 sbused(&so->so_rcv); 398 break; 399 case AF_UNIX: 400 if (so->so_pcb != NULL) { 401 unpcb = (struct unpcb *)(so->so_pcb); 402 if (unpcb->unp_conn) { 403 kif->kf_un.kf_sock.kf_sock_unpconn = 404 (uintptr_t)unpcb->unp_conn; 405 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 406 so->so_rcv.sb_state; 407 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 408 so->so_snd.sb_state; 409 kif->kf_un.kf_sock.kf_sock_sendq = 410 sbused(&so->so_snd); 411 kif->kf_un.kf_sock.kf_sock_recvq = 412 sbused(&so->so_rcv); 413 } 414 } 415 break; 416 } 417 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 418 if (error == 0 && 419 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 420 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 421 free(sa, M_SONAME); 422 } 423 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 424 if (error == 0 && 425 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 426 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 427 free(sa, M_SONAME); 428 } 429 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 430 sizeof(kif->kf_path)); 431 CURVNET_RESTORE(); 432 return (0); 433 } 434 435 /* 436 * Use the 'backend3' field in AIO jobs to store the amount of data 437 * completed by the AIO job so far. 438 */ 439 #define aio_done backend3 440 441 static STAILQ_HEAD(, task) soaio_jobs; 442 static struct mtx soaio_jobs_lock; 443 static struct task soaio_kproc_task; 444 static int soaio_starting, soaio_idle, soaio_queued; 445 static struct unrhdr *soaio_kproc_unr; 446 447 static int soaio_max_procs = MAX_AIO_PROCS; 448 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 449 "Maximum number of kernel processes to use for async socket IO"); 450 451 static int soaio_num_procs; 452 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 453 "Number of active kernel processes for async socket IO"); 454 455 static int soaio_target_procs = TARGET_AIO_PROCS; 456 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 457 &soaio_target_procs, 0, 458 "Preferred number of ready kernel processes for async socket IO"); 459 460 static int soaio_lifetime; 461 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 462 "Maximum lifetime for idle aiod"); 463 464 static void 465 soaio_kproc_loop(void *arg) 466 { 467 struct proc *p; 468 struct vmspace *myvm; 469 struct task *task; 470 int error, id, pending; 471 472 id = (intptr_t)arg; 473 474 /* 475 * Grab an extra reference on the daemon's vmspace so that it 476 * doesn't get freed by jobs that switch to a different 477 * vmspace. 478 */ 479 p = curproc; 480 myvm = vmspace_acquire_ref(p); 481 482 mtx_lock(&soaio_jobs_lock); 483 MPASS(soaio_starting > 0); 484 soaio_starting--; 485 for (;;) { 486 while (!STAILQ_EMPTY(&soaio_jobs)) { 487 task = STAILQ_FIRST(&soaio_jobs); 488 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 489 soaio_queued--; 490 pending = task->ta_pending; 491 task->ta_pending = 0; 492 mtx_unlock(&soaio_jobs_lock); 493 494 task->ta_func(task->ta_context, pending); 495 496 mtx_lock(&soaio_jobs_lock); 497 } 498 MPASS(soaio_queued == 0); 499 500 if (p->p_vmspace != myvm) { 501 mtx_unlock(&soaio_jobs_lock); 502 vmspace_switch_aio(myvm); 503 mtx_lock(&soaio_jobs_lock); 504 continue; 505 } 506 507 soaio_idle++; 508 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 509 soaio_lifetime); 510 soaio_idle--; 511 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 512 soaio_num_procs > soaio_target_procs) 513 break; 514 } 515 soaio_num_procs--; 516 mtx_unlock(&soaio_jobs_lock); 517 free_unr(soaio_kproc_unr, id); 518 kproc_exit(0); 519 } 520 521 static void 522 soaio_kproc_create(void *context, int pending) 523 { 524 struct proc *p; 525 int error, id; 526 527 mtx_lock(&soaio_jobs_lock); 528 for (;;) { 529 if (soaio_num_procs < soaio_target_procs) { 530 /* Must create */ 531 } else if (soaio_num_procs >= soaio_max_procs) { 532 /* 533 * Hit the limit on kernel processes, don't 534 * create another one. 535 */ 536 break; 537 } else if (soaio_queued <= soaio_idle + soaio_starting) { 538 /* 539 * No more AIO jobs waiting for a process to be 540 * created, so stop. 541 */ 542 break; 543 } 544 soaio_starting++; 545 mtx_unlock(&soaio_jobs_lock); 546 547 id = alloc_unr(soaio_kproc_unr); 548 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 549 &p, 0, 0, "soaiod%d", id); 550 if (error != 0) { 551 free_unr(soaio_kproc_unr, id); 552 mtx_lock(&soaio_jobs_lock); 553 soaio_starting--; 554 break; 555 } 556 557 mtx_lock(&soaio_jobs_lock); 558 soaio_num_procs++; 559 } 560 mtx_unlock(&soaio_jobs_lock); 561 } 562 563 void 564 soaio_enqueue(struct task *task) 565 { 566 567 mtx_lock(&soaio_jobs_lock); 568 MPASS(task->ta_pending == 0); 569 task->ta_pending++; 570 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 571 soaio_queued++; 572 if (soaio_queued <= soaio_idle) 573 wakeup_one(&soaio_idle); 574 else if (soaio_num_procs < soaio_max_procs) 575 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 576 mtx_unlock(&soaio_jobs_lock); 577 } 578 579 static void 580 soaio_init(void) 581 { 582 583 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 584 STAILQ_INIT(&soaio_jobs); 585 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 586 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 587 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 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, sb_which which, struct kaiocb *job) 599 { 600 struct ucred *td_savedcred; 601 struct thread *td; 602 struct sockbuf *sb = sobuf(so, which); 603 #ifdef MAC 604 struct file *fp = job->fd_file; 605 #endif 606 size_t cnt, done, job_total_nbytes __diagused; 607 long ru_before; 608 int error, flags; 609 610 SOCK_BUF_UNLOCK(so, which); 611 aio_switch_vmspace(job); 612 td = curthread; 613 retry: 614 td_savedcred = td->td_ucred; 615 td->td_ucred = job->cred; 616 617 job_total_nbytes = job->uiop->uio_resid + job->aio_done; 618 done = job->aio_done; 619 cnt = job->uiop->uio_resid; 620 job->uiop->uio_offset = 0; 621 job->uiop->uio_td = td; 622 flags = MSG_NBIO; 623 624 /* 625 * For resource usage accounting, only count a completed request 626 * as a single message to avoid counting multiple calls to 627 * sosend/soreceive on a blocking socket. 628 */ 629 630 if (sb == &so->so_rcv) { 631 ru_before = td->td_ru.ru_msgrcv; 632 #ifdef MAC 633 error = mac_socket_check_receive(fp->f_cred, so); 634 if (error == 0) 635 636 #endif 637 error = soreceive(so, NULL, job->uiop, NULL, NULL, 638 &flags); 639 if (td->td_ru.ru_msgrcv != ru_before) 640 job->msgrcv = 1; 641 } else { 642 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 643 flags |= MSG_MORETOCOME; 644 ru_before = td->td_ru.ru_msgsnd; 645 #ifdef MAC 646 error = mac_socket_check_send(fp->f_cred, so); 647 if (error == 0) 648 #endif 649 error = sosend(so, NULL, job->uiop, NULL, NULL, flags, 650 td); 651 if (td->td_ru.ru_msgsnd != ru_before) 652 job->msgsnd = 1; 653 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 654 PROC_LOCK(job->userproc); 655 kern_psignal(job->userproc, SIGPIPE); 656 PROC_UNLOCK(job->userproc); 657 } 658 } 659 660 done += cnt - job->uiop->uio_resid; 661 job->aio_done = done; 662 td->td_ucred = td_savedcred; 663 664 if (error == EWOULDBLOCK) { 665 /* 666 * The request was either partially completed or not 667 * completed at all due to racing with a read() or 668 * write() on the socket. If the socket is 669 * non-blocking, return with any partial completion. 670 * If the socket is blocking or if no progress has 671 * been made, requeue this request at the head of the 672 * queue to try again when the socket is ready. 673 */ 674 MPASS(done != job_total_nbytes); 675 SOCK_BUF_LOCK(so, which); 676 if (done == 0 || !(so->so_state & SS_NBIO)) { 677 empty_results++; 678 if (soaio_ready(so, sb)) { 679 empty_retries++; 680 SOCK_BUF_UNLOCK(so, which); 681 goto retry; 682 } 683 684 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 685 SOCK_BUF_UNLOCK(so, which); 686 if (done != 0) 687 aio_complete(job, done, 0); 688 else 689 aio_cancel(job); 690 SOCK_BUF_LOCK(so, which); 691 } else { 692 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 693 } 694 return; 695 } 696 SOCK_BUF_UNLOCK(so, which); 697 } 698 if (done != 0 && (error == ERESTART || error == EINTR || 699 error == EWOULDBLOCK)) 700 error = 0; 701 if (error) 702 aio_complete(job, -1, error); 703 else 704 aio_complete(job, done, 0); 705 SOCK_BUF_LOCK(so, which); 706 } 707 708 static void 709 soaio_process_sb(struct socket *so, sb_which which) 710 { 711 struct kaiocb *job; 712 struct sockbuf *sb = sobuf(so, which); 713 714 CURVNET_SET(so->so_vnet); 715 SOCK_BUF_LOCK(so, which); 716 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 717 job = TAILQ_FIRST(&sb->sb_aiojobq); 718 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 719 if (!aio_clear_cancel_function(job)) 720 continue; 721 722 soaio_process_job(so, which, job); 723 } 724 725 /* 726 * If there are still pending requests, the socket must not be 727 * ready so set SB_AIO to request a wakeup when the socket 728 * becomes ready. 729 */ 730 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 731 sb->sb_flags |= SB_AIO; 732 sb->sb_flags &= ~SB_AIO_RUNNING; 733 SOCK_BUF_UNLOCK(so, which); 734 735 sorele(so); 736 CURVNET_RESTORE(); 737 } 738 739 void 740 soaio_rcv(void *context, int pending) 741 { 742 struct socket *so; 743 744 so = context; 745 soaio_process_sb(so, SO_RCV); 746 } 747 748 void 749 soaio_snd(void *context, int pending) 750 { 751 struct socket *so; 752 753 so = context; 754 soaio_process_sb(so, SO_SND); 755 } 756 757 void 758 sowakeup_aio(struct socket *so, sb_which which) 759 { 760 struct sockbuf *sb = sobuf(so, which); 761 762 SOCK_BUF_LOCK_ASSERT(so, which); 763 764 sb->sb_flags &= ~SB_AIO; 765 if (sb->sb_flags & SB_AIO_RUNNING) 766 return; 767 sb->sb_flags |= SB_AIO_RUNNING; 768 soref(so); 769 soaio_enqueue(&sb->sb_aiotask); 770 } 771 772 static void 773 soo_aio_cancel(struct kaiocb *job) 774 { 775 struct socket *so; 776 struct sockbuf *sb; 777 long done; 778 int opcode; 779 sb_which which; 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 which = SO_RCV; 786 } else { 787 MPASS(opcode & LIO_WRITE); 788 sb = &so->so_snd; 789 which = SO_SND; 790 } 791 792 SOCK_BUF_LOCK(so, which); 793 if (!aio_cancel_cleared(job)) 794 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 795 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 796 sb->sb_flags &= ~SB_AIO; 797 SOCK_BUF_UNLOCK(so, which); 798 799 done = job->aio_done; 800 if (done != 0) 801 aio_complete(job, done, 0); 802 else 803 aio_cancel(job); 804 } 805 806 static int 807 soo_aio_queue(struct file *fp, struct kaiocb *job) 808 { 809 struct socket *so; 810 struct sockbuf *sb; 811 sb_which which; 812 int error; 813 814 so = fp->f_data; 815 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 816 if (error == 0) 817 return (0); 818 819 /* Lock through the socket, since this may be a listening socket. */ 820 switch (job->uaiocb.aio_lio_opcode & (LIO_WRITE | LIO_READ)) { 821 case LIO_READ: 822 SOCK_RECVBUF_LOCK(so); 823 sb = &so->so_rcv; 824 which = SO_RCV; 825 break; 826 case LIO_WRITE: 827 SOCK_SENDBUF_LOCK(so); 828 sb = &so->so_snd; 829 which = SO_SND; 830 break; 831 default: 832 return (EINVAL); 833 } 834 835 if (SOLISTENING(so)) { 836 SOCK_BUF_UNLOCK(so, which); 837 return (EINVAL); 838 } 839 840 if (!aio_set_cancel_function(job, soo_aio_cancel)) 841 panic("new job was cancelled"); 842 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 843 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 844 if (soaio_ready(so, sb)) 845 sowakeup_aio(so, which); 846 else 847 sb->sb_flags |= SB_AIO; 848 } 849 SOCK_BUF_UNLOCK(so, which); 850 return (0); 851 } 852