Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_socket.c
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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: releng/12.0/sys/kern/sys_socket.c 327844 2018-01-11 20:26:17Z tuexen $"); 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, 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 #ifdef MAC 291 int error; 292 #endif 293 294 bzero((caddr_t)ub, sizeof (*ub)); 295 ub->st_mode = S_IFSOCK; 296 #ifdef MAC 297 error = mac_socket_check_stat(active_cred, so); 298 if (error) 299 return (error); 300 #endif 301 if (!SOLISTENING(so)) { 302 struct sockbuf *sb; 303 304 /* 305 * If SBS_CANTRCVMORE is set, but there's still data left 306 * in the receive buffer, the socket is still readable. 307 */ 308 sb = &so->so_rcv; 309 SOCKBUF_LOCK(sb); 310 if ((sb->sb_state & SBS_CANTRCVMORE) == 0 || sbavail(sb)) 311 ub->st_mode |= S_IRUSR | S_IRGRP | S_IROTH; 312 ub->st_size = sbavail(sb) - sb->sb_ctl; 313 SOCKBUF_UNLOCK(sb); 314 315 sb = &so->so_snd; 316 SOCKBUF_LOCK(sb); 317 if ((sb->sb_state & SBS_CANTSENDMORE) == 0) 318 ub->st_mode |= S_IWUSR | S_IWGRP | S_IWOTH; 319 SOCKBUF_UNLOCK(sb); 320 } 321 ub->st_uid = so->so_cred->cr_uid; 322 ub->st_gid = so->so_cred->cr_gid; 323 return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); 324 } 325 326 /* 327 * API socket close on file pointer. We call soclose() to close the socket 328 * (including initiating closing protocols). soclose() will sorele() the 329 * file reference but the actual socket will not go away until the socket's 330 * ref count hits 0. 331 */ 332 static int 333 soo_close(struct file *fp, struct thread *td) 334 { 335 int error = 0; 336 struct socket *so; 337 338 so = fp->f_data; 339 fp->f_ops = &badfileops; 340 fp->f_data = NULL; 341 342 if (so) 343 error = soclose(so); 344 return (error); 345 } 346 347 static int 348 soo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) 349 { 350 struct sockaddr *sa; 351 struct inpcb *inpcb; 352 struct unpcb *unpcb; 353 struct socket *so; 354 int error; 355 356 kif->kf_type = KF_TYPE_SOCKET; 357 so = fp->f_data; 358 CURVNET_SET(so->so_vnet); 359 kif->kf_un.kf_sock.kf_sock_domain0 = 360 so->so_proto->pr_domain->dom_family; 361 kif->kf_un.kf_sock.kf_sock_type0 = so->so_type; 362 kif->kf_un.kf_sock.kf_sock_protocol0 = so->so_proto->pr_protocol; 363 kif->kf_un.kf_sock.kf_sock_pcb = (uintptr_t)so->so_pcb; 364 switch (kif->kf_un.kf_sock.kf_sock_domain0) { 365 case AF_INET: 366 case AF_INET6: 367 if (kif->kf_un.kf_sock.kf_sock_protocol0 == IPPROTO_TCP) { 368 if (so->so_pcb != NULL) { 369 inpcb = (struct inpcb *)(so->so_pcb); 370 kif->kf_un.kf_sock.kf_sock_inpcb = 371 (uintptr_t)inpcb->inp_ppcb; 372 kif->kf_un.kf_sock.kf_sock_sendq = 373 sbused(&so->so_snd); 374 kif->kf_un.kf_sock.kf_sock_recvq = 375 sbused(&so->so_rcv); 376 } 377 } 378 break; 379 case AF_UNIX: 380 if (so->so_pcb != NULL) { 381 unpcb = (struct unpcb *)(so->so_pcb); 382 if (unpcb->unp_conn) { 383 kif->kf_un.kf_sock.kf_sock_unpconn = 384 (uintptr_t)unpcb->unp_conn; 385 kif->kf_un.kf_sock.kf_sock_rcv_sb_state = 386 so->so_rcv.sb_state; 387 kif->kf_un.kf_sock.kf_sock_snd_sb_state = 388 so->so_snd.sb_state; 389 kif->kf_un.kf_sock.kf_sock_sendq = 390 sbused(&so->so_snd); 391 kif->kf_un.kf_sock.kf_sock_recvq = 392 sbused(&so->so_rcv); 393 } 394 } 395 break; 396 } 397 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa); 398 if (error == 0 && 399 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_local)) { 400 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_local, sa->sa_len); 401 free(sa, M_SONAME); 402 } 403 error = so->so_proto->pr_usrreqs->pru_peeraddr(so, &sa); 404 if (error == 0 && 405 sa->sa_len <= sizeof(kif->kf_un.kf_sock.kf_sa_peer)) { 406 bcopy(sa, &kif->kf_un.kf_sock.kf_sa_peer, sa->sa_len); 407 free(sa, M_SONAME); 408 } 409 strncpy(kif->kf_path, so->so_proto->pr_domain->dom_name, 410 sizeof(kif->kf_path)); 411 CURVNET_RESTORE(); 412 return (0); 413 } 414 415 /* 416 * Use the 'backend3' field in AIO jobs to store the amount of data 417 * completed by the AIO job so far. 418 */ 419 #define aio_done backend3 420 421 static STAILQ_HEAD(, task) soaio_jobs; 422 static struct mtx soaio_jobs_lock; 423 static struct task soaio_kproc_task; 424 static int soaio_starting, soaio_idle, soaio_queued; 425 static struct unrhdr *soaio_kproc_unr; 426 427 static int soaio_max_procs = MAX_AIO_PROCS; 428 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, max_procs, CTLFLAG_RW, &soaio_max_procs, 0, 429 "Maximum number of kernel processes to use for async socket IO"); 430 431 static int soaio_num_procs; 432 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, num_procs, CTLFLAG_RD, &soaio_num_procs, 0, 433 "Number of active kernel processes for async socket IO"); 434 435 static int soaio_target_procs = TARGET_AIO_PROCS; 436 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, target_procs, CTLFLAG_RD, 437 &soaio_target_procs, 0, 438 "Preferred number of ready kernel processes for async socket IO"); 439 440 static int soaio_lifetime; 441 SYSCTL_INT(_kern_ipc_aio, OID_AUTO, lifetime, CTLFLAG_RW, &soaio_lifetime, 0, 442 "Maximum lifetime for idle aiod"); 443 444 static void 445 soaio_kproc_loop(void *arg) 446 { 447 struct proc *p; 448 struct vmspace *myvm; 449 struct task *task; 450 int error, id, pending; 451 452 id = (intptr_t)arg; 453 454 /* 455 * Grab an extra reference on the daemon's vmspace so that it 456 * doesn't get freed by jobs that switch to a different 457 * vmspace. 458 */ 459 p = curproc; 460 myvm = vmspace_acquire_ref(p); 461 462 mtx_lock(&soaio_jobs_lock); 463 MPASS(soaio_starting > 0); 464 soaio_starting--; 465 for (;;) { 466 while (!STAILQ_EMPTY(&soaio_jobs)) { 467 task = STAILQ_FIRST(&soaio_jobs); 468 STAILQ_REMOVE_HEAD(&soaio_jobs, ta_link); 469 soaio_queued--; 470 pending = task->ta_pending; 471 task->ta_pending = 0; 472 mtx_unlock(&soaio_jobs_lock); 473 474 task->ta_func(task->ta_context, pending); 475 476 mtx_lock(&soaio_jobs_lock); 477 } 478 MPASS(soaio_queued == 0); 479 480 if (p->p_vmspace != myvm) { 481 mtx_unlock(&soaio_jobs_lock); 482 vmspace_switch_aio(myvm); 483 mtx_lock(&soaio_jobs_lock); 484 continue; 485 } 486 487 soaio_idle++; 488 error = mtx_sleep(&soaio_idle, &soaio_jobs_lock, 0, "-", 489 soaio_lifetime); 490 soaio_idle--; 491 if (error == EWOULDBLOCK && STAILQ_EMPTY(&soaio_jobs) && 492 soaio_num_procs > soaio_target_procs) 493 break; 494 } 495 soaio_num_procs--; 496 mtx_unlock(&soaio_jobs_lock); 497 free_unr(soaio_kproc_unr, id); 498 kproc_exit(0); 499 } 500 501 static void 502 soaio_kproc_create(void *context, int pending) 503 { 504 struct proc *p; 505 int error, id; 506 507 mtx_lock(&soaio_jobs_lock); 508 for (;;) { 509 if (soaio_num_procs < soaio_target_procs) { 510 /* Must create */ 511 } else if (soaio_num_procs >= soaio_max_procs) { 512 /* 513 * Hit the limit on kernel processes, don't 514 * create another one. 515 */ 516 break; 517 } else if (soaio_queued <= soaio_idle + soaio_starting) { 518 /* 519 * No more AIO jobs waiting for a process to be 520 * created, so stop. 521 */ 522 break; 523 } 524 soaio_starting++; 525 mtx_unlock(&soaio_jobs_lock); 526 527 id = alloc_unr(soaio_kproc_unr); 528 error = kproc_create(soaio_kproc_loop, (void *)(intptr_t)id, 529 &p, 0, 0, "soaiod%d", id); 530 if (error != 0) { 531 free_unr(soaio_kproc_unr, id); 532 mtx_lock(&soaio_jobs_lock); 533 soaio_starting--; 534 break; 535 } 536 537 mtx_lock(&soaio_jobs_lock); 538 soaio_num_procs++; 539 } 540 mtx_unlock(&soaio_jobs_lock); 541 } 542 543 void 544 soaio_enqueue(struct task *task) 545 { 546 547 mtx_lock(&soaio_jobs_lock); 548 MPASS(task->ta_pending == 0); 549 task->ta_pending++; 550 STAILQ_INSERT_TAIL(&soaio_jobs, task, ta_link); 551 soaio_queued++; 552 if (soaio_queued <= soaio_idle) 553 wakeup_one(&soaio_idle); 554 else if (soaio_num_procs < soaio_max_procs) 555 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 556 mtx_unlock(&soaio_jobs_lock); 557 } 558 559 static void 560 soaio_init(void) 561 { 562 563 soaio_lifetime = AIOD_LIFETIME_DEFAULT; 564 STAILQ_INIT(&soaio_jobs); 565 mtx_init(&soaio_jobs_lock, "soaio jobs", NULL, MTX_DEF); 566 soaio_kproc_unr = new_unrhdr(1, INT_MAX, NULL); 567 TASK_INIT(&soaio_kproc_task, 0, soaio_kproc_create, NULL); 568 if (soaio_target_procs > 0) 569 taskqueue_enqueue(taskqueue_thread, &soaio_kproc_task); 570 } 571 SYSINIT(soaio, SI_SUB_VFS, SI_ORDER_ANY, soaio_init, NULL); 572 573 static __inline int 574 soaio_ready(struct socket *so, struct sockbuf *sb) 575 { 576 return (sb == &so->so_rcv ? soreadable(so) : sowriteable(so)); 577 } 578 579 static void 580 soaio_process_job(struct socket *so, struct sockbuf *sb, struct kaiocb *job) 581 { 582 struct ucred *td_savedcred; 583 struct thread *td; 584 struct file *fp; 585 struct uio uio; 586 struct iovec iov; 587 size_t cnt, done; 588 long ru_before; 589 int error, flags; 590 591 SOCKBUF_UNLOCK(sb); 592 aio_switch_vmspace(job); 593 td = curthread; 594 fp = job->fd_file; 595 retry: 596 td_savedcred = td->td_ucred; 597 td->td_ucred = job->cred; 598 599 done = job->aio_done; 600 cnt = job->uaiocb.aio_nbytes - done; 601 iov.iov_base = (void *)((uintptr_t)job->uaiocb.aio_buf + done); 602 iov.iov_len = cnt; 603 uio.uio_iov = &iov; 604 uio.uio_iovcnt = 1; 605 uio.uio_offset = 0; 606 uio.uio_resid = cnt; 607 uio.uio_segflg = UIO_USERSPACE; 608 uio.uio_td = td; 609 flags = MSG_NBIO; 610 611 /* 612 * For resource usage accounting, only count a completed request 613 * as a single message to avoid counting multiple calls to 614 * sosend/soreceive on a blocking socket. 615 */ 616 617 if (sb == &so->so_rcv) { 618 uio.uio_rw = UIO_READ; 619 ru_before = td->td_ru.ru_msgrcv; 620 #ifdef MAC 621 error = mac_socket_check_receive(fp->f_cred, so); 622 if (error == 0) 623 624 #endif 625 error = soreceive(so, NULL, &uio, NULL, NULL, &flags); 626 if (td->td_ru.ru_msgrcv != ru_before) 627 job->msgrcv = 1; 628 } else { 629 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 630 flags |= MSG_MORETOCOME; 631 uio.uio_rw = UIO_WRITE; 632 ru_before = td->td_ru.ru_msgsnd; 633 #ifdef MAC 634 error = mac_socket_check_send(fp->f_cred, so); 635 if (error == 0) 636 #endif 637 error = sosend(so, NULL, &uio, NULL, NULL, flags, td); 638 if (td->td_ru.ru_msgsnd != ru_before) 639 job->msgsnd = 1; 640 if (error == EPIPE && (so->so_options & SO_NOSIGPIPE) == 0) { 641 PROC_LOCK(job->userproc); 642 kern_psignal(job->userproc, SIGPIPE); 643 PROC_UNLOCK(job->userproc); 644 } 645 } 646 647 done += cnt - uio.uio_resid; 648 job->aio_done = done; 649 td->td_ucred = td_savedcred; 650 651 if (error == EWOULDBLOCK) { 652 /* 653 * The request was either partially completed or not 654 * completed at all due to racing with a read() or 655 * write() on the socket. If the socket is 656 * non-blocking, return with any partial completion. 657 * If the socket is blocking or if no progress has 658 * been made, requeue this request at the head of the 659 * queue to try again when the socket is ready. 660 */ 661 MPASS(done != job->uaiocb.aio_nbytes); 662 SOCKBUF_LOCK(sb); 663 if (done == 0 || !(so->so_state & SS_NBIO)) { 664 empty_results++; 665 if (soaio_ready(so, sb)) { 666 empty_retries++; 667 SOCKBUF_UNLOCK(sb); 668 goto retry; 669 } 670 671 if (!aio_set_cancel_function(job, soo_aio_cancel)) { 672 SOCKBUF_UNLOCK(sb); 673 if (done != 0) 674 aio_complete(job, done, 0); 675 else 676 aio_cancel(job); 677 SOCKBUF_LOCK(sb); 678 } else { 679 TAILQ_INSERT_HEAD(&sb->sb_aiojobq, job, list); 680 } 681 return; 682 } 683 SOCKBUF_UNLOCK(sb); 684 } 685 if (done != 0 && (error == ERESTART || error == EINTR || 686 error == EWOULDBLOCK)) 687 error = 0; 688 if (error) 689 aio_complete(job, -1, error); 690 else 691 aio_complete(job, done, 0); 692 SOCKBUF_LOCK(sb); 693 } 694 695 static void 696 soaio_process_sb(struct socket *so, struct sockbuf *sb) 697 { 698 struct kaiocb *job; 699 700 CURVNET_SET(so->so_vnet); 701 SOCKBUF_LOCK(sb); 702 while (!TAILQ_EMPTY(&sb->sb_aiojobq) && soaio_ready(so, sb)) { 703 job = TAILQ_FIRST(&sb->sb_aiojobq); 704 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 705 if (!aio_clear_cancel_function(job)) 706 continue; 707 708 soaio_process_job(so, sb, job); 709 } 710 711 /* 712 * If there are still pending requests, the socket must not be 713 * ready so set SB_AIO to request a wakeup when the socket 714 * becomes ready. 715 */ 716 if (!TAILQ_EMPTY(&sb->sb_aiojobq)) 717 sb->sb_flags |= SB_AIO; 718 sb->sb_flags &= ~SB_AIO_RUNNING; 719 SOCKBUF_UNLOCK(sb); 720 721 SOCK_LOCK(so); 722 sorele(so); 723 CURVNET_RESTORE(); 724 } 725 726 void 727 soaio_rcv(void *context, int pending) 728 { 729 struct socket *so; 730 731 so = context; 732 soaio_process_sb(so, &so->so_rcv); 733 } 734 735 void 736 soaio_snd(void *context, int pending) 737 { 738 struct socket *so; 739 740 so = context; 741 soaio_process_sb(so, &so->so_snd); 742 } 743 744 void 745 sowakeup_aio(struct socket *so, struct sockbuf *sb) 746 { 747 748 SOCKBUF_LOCK_ASSERT(sb); 749 sb->sb_flags &= ~SB_AIO; 750 if (sb->sb_flags & SB_AIO_RUNNING) 751 return; 752 sb->sb_flags |= SB_AIO_RUNNING; 753 soref(so); 754 soaio_enqueue(&sb->sb_aiotask); 755 } 756 757 static void 758 soo_aio_cancel(struct kaiocb *job) 759 { 760 struct socket *so; 761 struct sockbuf *sb; 762 long done; 763 int opcode; 764 765 so = job->fd_file->f_data; 766 opcode = job->uaiocb.aio_lio_opcode; 767 if (opcode == LIO_READ) 768 sb = &so->so_rcv; 769 else { 770 MPASS(opcode == LIO_WRITE); 771 sb = &so->so_snd; 772 } 773 774 SOCKBUF_LOCK(sb); 775 if (!aio_cancel_cleared(job)) 776 TAILQ_REMOVE(&sb->sb_aiojobq, job, list); 777 if (TAILQ_EMPTY(&sb->sb_aiojobq)) 778 sb->sb_flags &= ~SB_AIO; 779 SOCKBUF_UNLOCK(sb); 780 781 done = job->aio_done; 782 if (done != 0) 783 aio_complete(job, done, 0); 784 else 785 aio_cancel(job); 786 } 787 788 static int 789 soo_aio_queue(struct file *fp, struct kaiocb *job) 790 { 791 struct socket *so; 792 struct sockbuf *sb; 793 int error; 794 795 so = fp->f_data; 796 error = (*so->so_proto->pr_usrreqs->pru_aio_queue)(so, job); 797 if (error == 0) 798 return (0); 799 800 switch (job->uaiocb.aio_lio_opcode) { 801 case LIO_READ: 802 sb = &so->so_rcv; 803 break; 804 case LIO_WRITE: 805 sb = &so->so_snd; 806 break; 807 default: 808 return (EINVAL); 809 } 810 811 SOCKBUF_LOCK(sb); 812 if (!aio_set_cancel_function(job, soo_aio_cancel)) 813 panic("new job was cancelled"); 814 TAILQ_INSERT_TAIL(&sb->sb_aiojobq, job, list); 815 if (!(sb->sb_flags & SB_AIO_RUNNING)) { 816 if (soaio_ready(so, sb)) 817 sowakeup_aio(so, sb); 818 else 819 sb->sb_flags |= SB_AIO; 820 } 821 SOCKBUF_UNLOCK(sb); 822 return (0); 823 }
Cache object: 6a3b56d4e7f24e4492d02ccfe71c5cef
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