sys_socket.c revision 331722
1/*- 2 * Copyright (c) 1982, 1986, 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)sys_socket.c 8.1 (Berkeley) 6/10/93 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: stable/11/sys/kern/sys_socket.c 331722 2018-03-29 02:50:57Z eadler $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/aio.h> 38#include <sys/domain.h> 39#include <sys/file.h> 40#include <sys/filedesc.h> 41#include <sys/kernel.h> 42#include <sys/kthread.h> 43#include <sys/malloc.h> 44#include <sys/proc.h> 45#include <sys/protosw.h> 46#include <sys/sigio.h> 47#include <sys/signal.h> 48#include <sys/signalvar.h> 49#include <sys/socket.h> 50#include <sys/socketvar.h> 51#include <sys/filio.h> /* XXX */ 52#include <sys/sockio.h> 53#include <sys/stat.h> 54#include <sys/sysctl.h> 55#include <sys/sysproto.h> 56#include <sys/taskqueue.h> 57#include <sys/uio.h> 58#include <sys/ucred.h> 59#include <sys/un.h> 60#include <sys/unpcb.h> 61#include <sys/user.h> 62 63#include <net/if.h> 64#include <net/if_var.h> 65#include <net/route.h> 66#include <net/vnet.h> 67 68#include <netinet/in.h> 69#include <netinet/in_pcb.h> 70 71#include <security/mac/mac_framework.h> 72 73#include <vm/vm.h> 74#include <vm/pmap.h> 75#include <vm/vm_extern.h> 76#include <vm/vm_map.h> 77 78static SYSCTL_NODE(_kern_ipc, OID_AUTO, aio, CTLFLAG_RD, NULL, 79 "socket AIO stats"); 80 81static int empty_results; 82SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_results, CTLFLAG_RD, &empty_results, 83 0, "socket operation returned EAGAIN"); 84 85static int empty_retries; 86SYSCTL_INT(_kern_ipc_aio, OID_AUTO, empty_retries, CTLFLAG_RD, &empty_retries, 87 0, "socket operation retries"); 88 89static fo_rdwr_t soo_read; 90static fo_rdwr_t soo_write; 91static fo_ioctl_t soo_ioctl; 92static fo_poll_t soo_poll; 93extern fo_kqfilter_t soo_kqfilter; 94static fo_stat_t soo_stat; 95static fo_close_t soo_close; 96static fo_fill_kinfo_t soo_fill_kinfo; 97static fo_aio_queue_t soo_aio_queue; 98 99static void soo_aio_cancel(struct kaiocb *job); 100 101struct fileops socketops = { 102 .fo_read = soo_read, 103 .fo_write = soo_write, 104 .fo_truncate = invfo_truncate, 105 .fo_ioctl = soo_ioctl, 106 .fo_poll = soo_poll, 107 .fo_kqfilter = soo_kqfilter, 108 .fo_stat = soo_stat, 109 .fo_close = soo_close, 110 .fo_chmod = invfo_chmod, 111 .fo_chown = invfo_chown, 112 .fo_sendfile = invfo_sendfile, 113 .fo_fill_kinfo = soo_fill_kinfo, 114 .fo_aio_queue = soo_aio_queue, 115 .fo_flags = DFLAG_PASSABLE 116}; 117 118static int 119soo_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 120 int flags, struct thread *td) 121{ 122 struct socket *so = fp->f_data; 123 int error; 124 125#ifdef MAC 126 error = mac_socket_check_receive(active_cred, so); 127 if (error) 128 return (error); 129#endif 130 error = soreceive(so, 0, uio, 0, 0, 0); 131 return (error); 132} 133 134static int 135soo_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 136 int flags, struct thread *td) 137{ 138 struct socket *so = fp->f_data; 139 int error; 140 141#ifdef MAC 142 error = mac_socket_check_send(active_cred, so); 143 if (error) 144 return (error); 145#endif 146 error = sosend(so, 0, uio, 0, 0, 0, uio->uio_td); 147 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 148 PROC_LOCK(uio->uio_td->td_proc); 149 tdsignal(uio->uio_td, SIGPIPE); 150 PROC_UNLOCK(uio->uio_td->td_proc); 151 } 152 return (error); 153} 154 155static int 156soo_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *active_cred, 157 struct thread *td) 158{ 159 struct socket *so = fp->f_data; 160 int error = 0; 161 162 switch (cmd) { 163 case FIONBIO: 164 SOCK_LOCK(so); 165 if (*(int *)data) 166 so->so_state |= SS_NBIO; 167 else 168 so->so_state &= ~SS_NBIO; 169 SOCK_UNLOCK(so); 170 break; 171 172 case FIOASYNC: 173 /* 174 * XXXRW: This code separately acquires SOCK_LOCK(so) and 175 * SOCKBUF_LOCK(&so->so_rcv) even though they are the same 176 * mutex to avoid introducing the assumption that they are 177 * the same. 178 */ 179 if (*(int *)data) { 180 SOCK_LOCK(so); 181 so->so_state |= SS_ASYNC; 182 SOCK_UNLOCK(so); 183 SOCKBUF_LOCK(&so->so_rcv); 184 so->so_rcv.sb_flags |= SB_ASYNC; 185 SOCKBUF_UNLOCK(&so->so_rcv); 186 SOCKBUF_LOCK(&so->so_snd); 187 so->so_snd.sb_flags |= SB_ASYNC; 188 SOCKBUF_UNLOCK(&so->so_snd); 189 } else { 190 SOCK_LOCK(so); 191 so->so_state &= ~SS_ASYNC; 192 SOCK_UNLOCK(so); 193 SOCKBUF_LOCK(&so->so_rcv); 194 so->so_rcv.sb_flags &= ~SB_ASYNC; 195 SOCKBUF_UNLOCK(&so->so_rcv); 196 SOCKBUF_LOCK(&so->so_snd); 197 so->so_snd.sb_flags &= ~SB_ASYNC; 198 SOCKBUF_UNLOCK(&so->so_snd); 199 } 200 break; 201 202 case FIONREAD: 203 /* Unlocked read. */ 204 *(int *)data = sbavail(&so->so_rcv); 205 break; 206 207 case FIONWRITE: 208 /* Unlocked read. */ 209 *(int *)data = sbavail(&so->so_snd); 210 break; 211 212 case FIONSPACE: 213 /* Unlocked read. */ 214 if ((so->so_snd.sb_hiwat < sbused(&so->so_snd)) || 215 (so->so_snd.sb_mbmax < so->so_snd.sb_mbcnt)) 216 *(int *)data = 0; 217 else 218 *(int *)data = sbspace(&so->so_snd); 219 break; 220 221 case FIOSETOWN: 222 error = fsetown(*(int *)data, &so->so_sigio); 223 break; 224 225 case FIOGETOWN: 226 *(int *)data = fgetown(&so->so_sigio); 227 break; 228 229 case SIOCSPGRP: 230 error = fsetown(-(*(int *)data), &so->so_sigio); 231 break; 232 233 case SIOCGPGRP: 234 *(int *)data = -fgetown(&so->so_sigio); 235 break; 236 237 case SIOCATMARK: 238 /* Unlocked read. */ 239 *(int *)data = (so->so_rcv.sb_state & SBS_RCVATMARK) != 0; 240 break; 241 default: 242 /* 243 * Interface/routing/protocol specific ioctls: interface and 244 * routing ioctls should have a different entry since a 245 * socket is unnecessary. 246 */ 247 if (IOCGROUP(cmd) == 'i') 248 error = ifioctl(so, cmd, data, td); 249 else if (IOCGROUP(cmd) == 'r') { 250 CURVNET_SET(so->so_vnet); 251 error = rtioctl_fib(cmd, data, so->so_fibnum); 252 CURVNET_RESTORE(); 253 } else { 254 CURVNET_SET(so->so_vnet); 255 error = ((*so->so_proto->pr_usrreqs->pru_control) 256 (so, cmd, data, 0, td)); 257 CURVNET_RESTORE(); 258 } 259 break; 260 } 261 return (error); 262} 263 264static int 265soo_poll(struct file *fp, int events, struct ucred *active_cred, 266 struct thread *td) 267{ 268 struct socket *so = fp->f_data; 269#ifdef MAC 270 int error; 271 272 error = mac_socket_check_poll(active_cred, so); 273 if (error) 274 return (error); 275#endif 276 return (sopoll(so, events, fp->f_cred, td)); 277} 278 279static int 280soo_stat(struct file *fp, struct stat *ub, struct ucred *active_cred, 281 struct thread *td) 282{ 283 struct socket *so = fp->f_data; 284 struct sockbuf *sb; 285#ifdef MAC 286 int error; 287#endif 288 289 bzero((caddr_t)ub, sizeof (*ub)); 290 ub->st_mode = S_IFSOCK; 291#ifdef MAC 292 error = mac_socket_check_stat(active_cred, so); 293 if (error) 294 return (error); 295#endif 296 /* 297 * If SBS_CANTRCVMORE is set, but there's still data left in the 298 * receive buffer, the socket is still readable. 299 */ 300 sb = &so->so_rcv; 301 SOCKBUF_LOCK(sb); 302 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 303 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 304 ub->st_size = sbavail(sb) - sb->sb_ctl; 305 SOCKBUF_UNLOCK(sb); 306 307 sb = &so->so_snd; 308 SOCKBUF_LOCK(sb); 309 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 310 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 311 SOCKBUF_UNLOCK(sb); 312 ub->st_uid = so->so_cred->cr_uid; 313 ub->st_gid = so->so_cred->cr_gid; 314 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 315} 316 317/* 318 * API socket close on file pointer. We call soclose() to close the socket 319 * (including initiating closing protocols). soclose() will sorele() the 320 * file reference but the actual socket will not go away until the socket's 321 * ref count hits 0. 322 */ 323static int 324soo_close(struct file *fp, struct thread *td) 325{ 326 int error = 0; 327 struct socket *so; 328 329 so = fp->f_data; 330 fp->f_ops = &badfileops; 331 fp->f_data = NULL; 332 333 if (so) 334 error = soclose(so); 335 return (error); 336} 337 338static int 339soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 340{ 341 struct sockaddr *sa; 342 struct inpcb *inpcb; 343 struct unpcb *unpcb; 344 struct socket *so; 345 int error; 346 347 kif->kf_type = KF_TYPE_SOCKET; 348 so = fp->f_data; 349 kif->kf_sock_domain = so->so_proto->pr_domain->dom_family; 350 kif->kf_sock_type = so->so_type; 351 kif->kf_sock_protocol = so->so_proto->pr_protocol; 352 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 353 switch (kif->kf_sock_domain) { 354 case AF_INET: 355 case AF_INET6: 356 if (kif->kf_sock_protocol == IPPROTO_TCP) { 357 if (so->so_pcb != NULL) { 358 inpcb = (struct inpcb *)(so->so_pcb); 359 kif->kf_un.kf_sock.kf_sock_inpcb = 360 (uintptr_t)inpcb->inp_ppcb; 361 } 362 } 363 break; 364 case AF_UNIX: 365 if (so->so_pcb != NULL) { 366 unpcb = (struct unpcb *)(so->so_pcb); 367 if (unpcb->unp_conn) { 368 kif->kf_un.kf_sock.kf_sock_unpconn = 369 (uintptr_t)unpcb->unp_conn; 370 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 371 so->so_rcv.sb_state; 372 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 373 so->so_snd.sb_state; 374 } 375 } 376 break; 377 } 378 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 379 if (error == 0 && sa->sa_len <= sizeof(kif->kf_sa_local)) { 380 bcopy(sa, &kif->kf_sa_local, sa->sa_len); 381 free(sa, M_SONAME); 382 } 383 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 384 if (error == 0 && sa->sa_len <= sizeof(kif->kf_sa_peer)) { 385 bcopy(sa, &kif->kf_sa_peer, sa->sa_len); 386 free(sa, M_SONAME); 387 } 388 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 389 sizeof(kif->kf_path)); 390 return (0); 391} 392 393/* 394 * Use the 'backend3' field in AIO jobs to store the amount of data 395 * completed by the AIO job so far. 396 */ 397#define aio_done backend3 398 399static STAILQ_HEAD(, task) soaio_jobs; 400static struct mtx soaio_jobs_lock; 401static struct task soaio_kproc_task; 402static int soaio_starting, soaio_idle, soaio_queued; 403static struct unrhdr *soaio_kproc_unr; 404 405static int soaio_max_procs = MAX_AIO_PROCS; 406SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 407 "Maximum number of kernel processes to use for async socket IO"); 408 409static int soaio_num_procs; 410SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 411 "Number of active kernel processes for async socket IO"); 412 413static int soaio_target_procs = TARGET_AIO_PROCS; 414SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 415 &soaio_target_procs, 0, 416 "Preferred number of ready kernel processes for async socket IO"); 417 418static int soaio_lifetime; 419SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 420 "Maximum lifetime for idle aiod"); 421 422static void 423soaio_kproc_loop(void *arg) 424{ 425 struct proc *p; 426 struct vmspace *myvm; 427 struct task *task; 428 int error, id, pending; 429 430 id = (intptr_t)arg; 431 432 /* 433 * Grab an extra reference on the daemon's vmspace so that it 434 * doesn't get freed by jobs that switch to a different 435 * vmspace. 436 */ 437 p = curproc; 438 myvm = vmspace_acquire_ref(p); 439 440 mtx_lock(&soaio_jobs_lock); 441 MPASS(soaio_starting > 0); 442 soaio_starting--; 443 for (;;) { 444 while (!STAILQ_EMPTY(&soaio_jobs)) { 445 task = STAILQ_FIRST(&soaio_jobs); 446 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 447 soaio_queued--; 448 pending = task->ta_pending; 449 task->ta_pending = 0; 450 mtx_unlock(&soaio_jobs_lock); 451 452 task->ta_func(task->ta_context, pending); 453 454 mtx_lock(&soaio_jobs_lock); 455 } 456 MPASS(soaio_queued == 0); 457 458 if (p->p_vmspace != myvm) { 459 mtx_unlock(&soaio_jobs_lock); 460 vmspace_switch_aio(myvm); 461 mtx_lock(&soaio_jobs_lock); 462 continue; 463 } 464 465 soaio_idle++; 466 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 467 soaio_lifetime); 468 soaio_idle--; 469 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 470 soaio_num_procs > soaio_target_procs) 471 break; 472 } 473 soaio_num_procs--; 474 mtx_unlock(&soaio_jobs_lock); 475 free_unr(soaio_kproc_unr, id); 476 kproc_exit(0); 477} 478 479static void 480soaio_kproc_create(void *context, int pending) 481{ 482 struct proc *p; 483 int error, id; 484 485 mtx_lock(&soaio_jobs_lock); 486 for (;;) { 487 if (soaio_num_procs < soaio_target_procs) { 488 /* Must create */ 489 } else if (soaio_num_procs >= soaio_max_procs) { 490 /* 491 * Hit the limit on kernel processes, don't 492 * create another one. 493 */ 494 break; 495 } else if (soaio_queued <= soaio_idle + soaio_starting) { 496 /* 497 * No more AIO jobs waiting for a process to be 498 * created, so stop. 499 */ 500 break; 501 } 502 soaio_starting++; 503 mtx_unlock(&soaio_jobs_lock); 504 505 id = alloc_unr(soaio_kproc_unr); 506 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 507 &p, 0, 0, "soaiod%d", id); 508 if (error != 0) { 509 free_unr(soaio_kproc_unr, id); 510 mtx_lock(&soaio_jobs_lock); 511 soaio_starting--; 512 break; 513 } 514 515 mtx_lock(&soaio_jobs_lock); 516 soaio_num_procs++; 517 } 518 mtx_unlock(&soaio_jobs_lock); 519} 520 521void 522soaio_enqueue(struct task *task) 523{ 524 525 mtx_lock(&soaio_jobs_lock); 526 MPASS(task->ta_pending == 0); 527 task->ta_pending++; 528 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 529 soaio_queued++; 530 if (soaio_queued <= soaio_idle) 531 wakeup_one(&soaio_idle); 532 else if (soaio_num_procs < soaio_max_procs) 533 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 534 mtx_unlock(&soaio_jobs_lock); 535} 536 537static void 538soaio_init(void) 539{ 540 541 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 542 STAILQ_INIT(&soaio_jobs); 543 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 544 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 545 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 546 if (soaio_target_procs > 0) 547 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 548} 549SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 550 551static __inline int 552soaio_ready(struct socket *so, struct sockbuf *sb) 553{ 554 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 555} 556 557static void 558soaio_process_job(struct socket *so, struct sockbuf *sb, struct kaiocb *job) 559{ 560 struct ucred *td_savedcred; 561 struct thread *td; 562 struct file *fp; 563 struct uio uio; 564 struct iovec iov; 565 size_t cnt, done; 566 long ru_before; 567 int error, flags; 568 569 SOCKBUF_UNLOCK(sb); 570 aio_switch_vmspace(job); 571 td = curthread; 572 fp = job->fd_file; 573retry: 574 td_savedcred = td->td_ucred; 575 td->td_ucred = job->cred; 576 577 done = job->aio_done; 578 cnt = job->uaiocb.aio_nbytes - done; 579 iov.iov_base = (void *)((uintptr_t)job->uaiocb.aio_buf + done); 580 iov.iov_len = cnt; 581 uio.uio_iov = &iov; 582 uio.uio_iovcnt = 1; 583 uio.uio_offset = 0; 584 uio.uio_resid = cnt; 585 uio.uio_segflg = UIO_USERSPACE; 586 uio.uio_td = td; 587 flags = MSG_NBIO; 588 589 /* 590 * For resource usage accounting, only count a completed request 591 * as a single message to avoid counting multiple calls to 592 * sosend/soreceive on a blocking socket. 593 */ 594 595 if (sb == &so->so_rcv) { 596 uio.uio_rw = UIO_READ; 597 ru_before = td->td_ru.ru_msgrcv; 598#ifdef MAC 599 error = mac_socket_check_receive(fp->f_cred, so); 600 if (error == 0) 601 602#endif 603 error = soreceive(so, NULL, &uio, NULL, NULL, &flags); 604 if (td->td_ru.ru_msgrcv != ru_before) 605 job->msgrcv = 1; 606 } else { 607 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 608 flags |= MSG_MORETOCOME; 609 uio.uio_rw = UIO_WRITE; 610 ru_before = td->td_ru.ru_msgsnd; 611#ifdef MAC 612 error = mac_socket_check_send(fp->f_cred, so); 613 if (error == 0) 614#endif 615 error = sosend(so, NULL, &uio, NULL, NULL, flags, td); 616 if (td->td_ru.ru_msgsnd != ru_before) 617 job->msgsnd = 1; 618 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 619 PROC_LOCK(job->userproc); 620 kern_psignal(job->userproc, SIGPIPE); 621 PROC_UNLOCK(job->userproc); 622 } 623 } 624 625 done += cnt - uio.uio_resid; 626 job->aio_done = done; 627 td->td_ucred = td_savedcred; 628 629 if (error == EWOULDBLOCK) { 630 /* 631 * The request was either partially completed or not 632 * completed at all due to racing with a read() or 633 * write() on the socket. If the socket is 634 * non-blocking, return with any partial completion. 635 * If the socket is blocking or if no progress has 636 * been made, requeue this request at the head of the 637 * queue to try again when the socket is ready. 638 */ 639 MPASS(done != job->uaiocb.aio_nbytes); 640 SOCKBUF_LOCK(sb); 641 if (done == 0 || !(so->so_state & SS_NBIO)) { 642 empty_results++; 643 if (soaio_ready(so, sb)) { 644 empty_retries++; 645 SOCKBUF_UNLOCK(sb); 646 goto retry; 647 } 648 649 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 650 SOCKBUF_UNLOCK(sb); 651 if (done != 0) 652 aio_complete(job, done, 0); 653 else 654 aio_cancel(job); 655 SOCKBUF_LOCK(sb); 656 } else { 657 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 658 } 659 return; 660 } 661 SOCKBUF_UNLOCK(sb); 662 } 663 if (done != 0 && (error == ERESTART || error == EINTR || 664 error == EWOULDBLOCK)) 665 error = 0; 666 if (error) 667 aio_complete(job, -1, error); 668 else 669 aio_complete(job, done, 0); 670 SOCKBUF_LOCK(sb); 671} 672 673static void 674soaio_process_sb(struct socket *so, struct sockbuf *sb) 675{ 676 struct kaiocb *job; 677 678 CURVNET_SET(so->so_vnet); 679 SOCKBUF_LOCK(sb); 680 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 681 job = TAILQ_FIRST(&sb->sb_aiojobq); 682 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 683 if (!aio_clear_cancel_function(job)) 684 continue; 685 686 soaio_process_job(so, sb, job); 687 } 688 689 /* 690 * If there are still pending requests, the socket must not be 691 * ready so set SB_AIO to request a wakeup when the socket 692 * becomes ready. 693 */ 694 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 695 sb->sb_flags |= SB_AIO; 696 sb->sb_flags &= ~SB_AIO_RUNNING; 697 SOCKBUF_UNLOCK(sb); 698 699 ACCEPT_LOCK(); 700 SOCK_LOCK(so); 701 sorele(so); 702 CURVNET_RESTORE(); 703} 704 705void 706soaio_rcv(void *context, int pending) 707{ 708 struct socket *so; 709 710 so = context; 711 soaio_process_sb(so, &so->so_rcv); 712} 713 714void 715soaio_snd(void *context, int pending) 716{ 717 struct socket *so; 718 719 so = context; 720 soaio_process_sb(so, &so->so_snd); 721} 722 723void 724sowakeup_aio(struct socket *so, struct sockbuf *sb) 725{ 726 727 SOCKBUF_LOCK_ASSERT(sb); 728 sb->sb_flags &= ~SB_AIO; 729 if (sb->sb_flags & SB_AIO_RUNNING) 730 return; 731 sb->sb_flags |= SB_AIO_RUNNING; 732 if (sb == &so->so_snd) 733 SOCK_LOCK(so); 734 soref(so); 735 if (sb == &so->so_snd) 736 SOCK_UNLOCK(so); 737 soaio_enqueue(&sb->sb_aiotask); 738} 739 740static void 741soo_aio_cancel(struct kaiocb *job) 742{ 743 struct socket *so; 744 struct sockbuf *sb; 745 long done; 746 int opcode; 747 748 so = job->fd_file->f_data; 749 opcode = job->uaiocb.aio_lio_opcode; 750 if (opcode == LIO_READ) 751 sb = &so->so_rcv; 752 else { 753 MPASS(opcode == LIO_WRITE); 754 sb = &so->so_snd; 755 } 756 757 SOCKBUF_LOCK(sb); 758 if (!aio_cancel_cleared(job)) 759 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 760 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 761 sb->sb_flags &= ~SB_AIO; 762 SOCKBUF_UNLOCK(sb); 763 764 done = job->aio_done; 765 if (done != 0) 766 aio_complete(job, done, 0); 767 else 768 aio_cancel(job); 769} 770 771static int 772soo_aio_queue(struct file *fp, struct kaiocb *job) 773{ 774 struct socket *so; 775 struct sockbuf *sb; 776 int error; 777 778 so = fp->f_data; 779 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 780 if (error == 0) 781 return (0); 782 783 switch (job->uaiocb.aio_lio_opcode) { 784 case LIO_READ: 785 sb = &so->so_rcv; 786 break; 787 case LIO_WRITE: 788 sb = &so->so_snd; 789 break; 790 default: 791 return (EINVAL); 792 } 793 794 SOCKBUF_LOCK(sb); 795 if (!aio_set_cancel_function(job, soo_aio_cancel)) 796 panic("new job was cancelled"); 797 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 798 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 799 if (soaio_ready(so, sb)) 800 sowakeup_aio(so, sb); 801 else 802 sb->sb_flags |= SB_AIO; 803 } 804 SOCKBUF_UNLOCK(sb); 805 return (0); 806} 807